Military Searchlight Computer (1930)

8/22/2019 Military Searchlight Computer (1930)

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1 , 9 7 6 , 7 2 7c t . 1 6 , 1934. F . R . HOUSESOUND LOCATOR AND COMPUTER FOR AIRCRAFT

F i l e d A u g . 7 , 1 9 3 0 8 S h e e t s - S h e e t 2

INVENTOR

@?/V/f?l/WSEWZMOH


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1,976,727 ct. 16, 1 9 3 4 . F . R . HOUSESOUND LOCATOR AND COMPUTER FOR AIRCRAFT

Filed A u g . 7 , 1930 8 Sheets-Sheet 5

i .0. .p . M,mms am m QN."xn\ m v k / i w x%a s


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1 , 9 7 6 , 7 2 7Oct. 1 6 , 1 9 3 4 . F . R . HOUSESOUND L O C A ' I O R AND COMPUTER FOR AIRCRAFT

Filed A u g . ' 7 , 1930 8 Sheets-Sheet 4

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1 , 9 7 6 , 7 2 7c t . 1 6 , 1 9 3 4 . F , R . HOUSESOUND LOCATOR AND COMPUTER FOR AIRCRAFT

Filed A u g . 7 , 1 9 3 0 8 Sheets-Sheet 5

275mg,


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1 , 9 7 6 , 7 2 7c t . 1 6 , 1 9 3 4 . F . R . HOUSESOUND LOCATOR AND COMPUTER FOR AIRCRAFT

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O c t - 1 6 , 1 9 3 4 - F . R . HOUSESOUND LOCATOR AND COMPUTER FOR AIRCRAFT

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1,976,727 "c t . 1 6 , 1934. F . R . HOUSE SOUND LOCA'IOR AND COMPUTER FOR AIRCRAFT

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o n . 3 2 . , o coral-omen c l l e l e c s r l Z e a E :

go ol o v e z a l l o o r e l a t e s t o f o r lccoemgand i5 o i r c l ' e i i ; o i . niche s o me ook

e i z ' c c e f ' l gu n moy c c d i r e c t e d e h e s e o u . S e c ?emcee Y oropcoe t o us e e sound l o c o e i o gd e v i c e such cc o lemme} sound l c c e i z o c c o o l . t oc h e r c ? r o m c o e e e r c ' o l l g h l t i m e l o c o , o z ? e m c e e , e i t h e r ? l l - e e r i l y o r t h r o u g h . a s c o m g s e z ' e t o e , e s f c e e a p p l y i n g c e r e e i n c o x c e c t i e n e .g o r o o l e o e o f whic h t h i s i n v e n t i o n i s o s o l u t i o nmy e Y c e e t e m o l o l m e d by r e f e r e n c e l o t h e o l e m e m o r y oiogrcm i n F i g . i . t h i s ?gure t h esound l c c e t o i ' i s shown e c L , t h e e e e i c l u l l g h t e t 5e n d . t h e comotor c t G. Th e d i r e c t i o n oneground s p e e d o i t l a e a i r p l a n e i s i n d i c a t e d by v e ct o r P and t h e d i r e c t i o n enolthe v e l o c i t y o f t h ewind s i n d i c a t e d by v e c t o r W; 1 1 t h e p o i n t Anewr e s e n t s t h e e o s i t i c n o f the a i r p l a n e a t t h e timet h e sound was t t e d , which i s heard a t L , thena n ' l e n e w l l l b e o t p o i n t ? b y t l i e t l m e t h ehosound r e a c h e s t h e sound l c c o t o r end i s h e a r d byt h e o p e r a t o r . ' a n g l e a , t h e r e f o r e , r e p r e s e n t ewh et be termed the sound l e g l e o r c o r - =l e c i s i o o . on c c o u n t o f t h e d i r e c t i o n end v e l o c i t yo f t h e d , h o w e v e r , t h e o p e r o t o r e s t L o e s n o t

perceive the sound es i i i t e from A, but s e = =c c i v c s it as i f i l c o m e from the point B, the dl i o v l n g c a r r i e d the sound c l o v e s t o e l e f t duei n s t h e t i m e o f t x ' o n s m i s e i o n from A o L . Th eangle e , t h e r e f o r e , represents w h a t may e 1 . o .the w i n d e r r o r o x " wind c o r r e c t i o n e a g l e . I f thes e e r c b l i g h t , t h e r e f o r e , were l o c a t e d c t L , l l e h o u l ohe p o i n t e d c l o n e the l i n e M3 o r SD, which i sp a r a l l e l t o LB. I t w i l l b e s e e n , h o w e v e r , t h a t i ft h e e e e r c h l i g h t i s p o i n l e d a l o n e SD c ' W ? l ne es t r i k e t h e t a r g e t on a c c o u n t o f t h e d i s t a n c ee p a r a t i n g t h e s e e r c h l i g h t end sound l o c e t o z .T h e r e f o r e , t h e r e i s a n o t h e r c o r r e c t i o n i n t r o d u c e d ,comely, t h e a n g l e c which i s moon s t h e pere l l e x c o r r e c t i o n . I t w i l l he understood t h a t a l lo f t h e s e e r r o r s a r e shown i nmed0 1 m i nt h e dlegrom and a l s o t h e diagram ehows'uthe r r o r s o n l y e nd i n t h e s i m p l e s t form where Fa ndW nd 1e are p a r a l l e l . There me l s o s i mi l a r e r r o r s i n e l e v a t i o n but s i n c e such e r r o r s are4 5 r e l a t i v e l y small a nd ar e based on l i n e com e prin

' c l p l e , me explanation regarding the s o m e n e e e lnot b e r e p e a t e d nor need a ll o f t h e m be takeni n t o c o n s i d er a t i o n i n t h e p r e f e r r e d t o o f mye p p o r o t u s .R e f e r r i n g now t o t h e d e t a i l e d dreams n e e ldicion to Fig. l ,

F i g . 2 r e p r e s e n t s t h e some t h r e e e l e m e n t s , soundl o c e t o r , c o m p e r e t o r , end s e e r c h l i g h t , a s showni n F i g . l on e . som ewha t l e i f g e z s c a l e .

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c i s o oiclgeemmoclc view c l one o i theEeyore c c " coseeclloo oxalic Fig.

c i s t ic view o 2 we eecorrecelco '

F i g . e l s o vie w of the elm owecllcnl a y e r .Fig. l i s o'veceicei eecllco apcrtloo of Fig. 5 .F i g - 858 2 1 s e c s i o a 12-.

portion oi Fig. 5.1 . I o i s e fcce V i e w of * 1 " : v - - c o m p l e t e com put er .

View 1 'mm. _ . .. . correction device also. adapted

i n cvetion a s w as i n azimuth.F i g . 1 1 i s o f r o n t e l e v a t i o n o f t h e s e o r c h l i g h twith the s o . . . u t z h c o n t r o l u n i t shownscctiou. -

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view o f e . coo. . andD. C. pub-coco o r w : ck mtcm-he sound locelor i s s oc ge n . : 1 : at L in '

F i g s . 1 o n e ] 2 e nd pref cc of a o fh e A a nd E . . mport l n ut h and.euother o f homo C and D spaced apart i ne l e v a t i o n . T h e r e i s on e r o t o r f o r each p a i r o f gohome, l : uth operator li s ~ : . w 1 : through theeerpicces i n the helmet E nd the e l e v a t i o n operetor - . * 1 - ;vughh e e a r pieces i n t h e h e l m e tF . A l l t h e h o m e tum o g e t h e r but t h e azimuthc o e r c i o n t them i n math hrough h a n d l eG , and t h e e l e v o t i o z l o p e r a t o r s i m i l a r l y c o n t r o l st h e horns i n e l e v a t i o n through t h e handle H. Thee x e c t t i o n s o f t h e horns l n uth end e l e v al i o n e r e not tttecl, owever, b u t , t h e c o r r e c ~c l o n e , h e r e t o f o r e e x c l a i m e d i n c o n n e c t i o n with F i g .l , e r e t i n t r o d u c e d ugh t h e d i ? e r e n t l e l s 6i n m . nt h end 7 i n e l e v o t i o n , th e c o m p u t i n g ,h b e low n t h e hose 1 3 o f t h es o u n d l o c o b o r .Refe now to . 3 showing the c om p u t ere t l c . d e v e l o p e d f o r m , t h e a z i m u t hi Ii . i c ei n c l e a rshell 8 connected tome ound l c c o t o r i s s hown ase n t e r i n g t h e . computer a t t h e l o w e r l e f t handcorner of the , e nd the s h e l l : 2 connected t ol l l e sound l o c o t o r i o e l e v e t i o n i s shown e s uc


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2j u s t above the shaft 8 . Th e shaft 8 i s s h o w n asdriving through s u i t a b l e gearing so a gear 3 6 l o o s e on the shaft 36 but w h i c h isnormeHy c oupled t o shaft 36 through a . gear 3 6 ' ? x e d to said

_ ; shaft a nd a . pinion 71 w h i c h m e s h e s normally"

a " ; the gear a ?

with both gears 3 8 and 3 6 " and s mounted on e ,s l i d e b l e s h a f t 6 4 . Shaft 36 extends e n t i r e l ythrough two s l e e v e s , inner s l e e v e 37 a nd outers l e e v e 3 8 , a nd c a r r i e s at i t s r i g h t hand e nd a tp o i n ' l ' e r 5 0 , which s h o w s , t h e r e f o r e , c o n t i n u o u s l ythe co mpas s o r a z i m u t h angle o f the sound l o c u t o i ' .Similarly the e l e v a t i o n angle i s s h own on d i a l 3 5 on shaft 35 whic h i s geared to shaft 2 throughg e e - r i n g T 2 . The l e e v e 37 i s shown s driven Z r " 3 .c a r r i e s a t i t s righthend end ;d i a l 2 9 , wh ich shows the c o m p a s s w i n d deviationangle 0 1 wind d i r e c t i o n with r e s p e c t t o n o r t h ,while the outer s l e e v e 38 is s h o w n as driven f romthe gear 3 8 e nd c a s r i e s through t h e 2 8

" I eonoen'mo ennulor dial 28 shows thesome

m e :

pass b a s e l i n e deviation angle o r the angle tha t thebaseline LS m a k e s with north. In connectionwith t h e s e a f o r e s a i d d i a l s a nd p o i n t e r s , thererovided a n outer ?xed d i e d 14 having compas smos-kings 'For th e p u r p o s e of i n i t i a l l y s e t t i n g , and ; , ~ ae h r o n l z i n g t h e d e v i c e I p r o v i d e a . setting-mob sowh ich i s s h own as having f o u r : p o s i t i o n s . whent h e mob s pushed t o i t s extreme r i g h t p o s i t i o n ,which may e termed-the ?rst p o s i t i o n , the pinionso on the shaft 61 thereof i s brought i n t o meshwith the gear 3 8 ' . At the s o m e time, d ue t o thea c t i o n o f t h e p i v o t e d c l u t c h m e m b e r s 6263,theshaft 64 i s moved n the reverse d i r e c t i n hrowingthe pinion Soto the l e f t ou t o f m e s h h ear 3 8 ,when he p a r t s ar e i n t h i s p o s i t i o n the knob 48 i sturned u n t i l the d i a l 28 on the u p p e r s l e e v e i s s e tf o r the b a s e l i n e d e v i a t i o n a n g l e . When he knobi s in the p o s i t i o n s hown i n the drawings, i . e . ,

" 1 position 2 , th e parts areiin their n o r m a l operatingp o s i t i o n so that the proper c o r r e c t i o n d ate i scontinuously generated w i t h the shaft as con=' t l n w u s l y driven from the s h a f t 8 through the" M i s . when the hnobis moved into the

g . 3 , seer 66 i s engaged-wit h goes 3 ' ? li s t h r o w n ou t o f mesh th e seerc a v i n g , the pinion 7 1 in m e s h with bothand 6 5 i and p i n i o n 6 5 remaining i n m e s hgear s o . In t h i s p o s i t i o n , t h e r e i o r e , theith

1 udjustment oi th e knob 4 8 sets th e m i d d l e sleeve

6 6

7 5

or the d i a l 29 for the wind deviation a n g l e . Inthe fourth o r synchronizing p o s i t i o n , gear 68re mains in mesh with gear 3 7 ' a nd the e x t r a . gear6 ' 7 secured t o the gear 6 7 i s brought i n t o m e s hwith the g e a r . 3 ' 7 , a nd gear 7 1 i s disengaged froml o o s e gear 3 6 " with which 40 meshes. I f d e s i r e d ,an i n d i c a t o r 49 may be operated from knob 48showing w h i c h o f the four p o s i t i o n s . the knob i s i n( s e e F i g . 9 ) . when nob 48 i s t u r n e d , t h e r e f o r e ,p o i n t e r 5 0 may be turned t o show the a ngle thesound locator makes to north.I take 0 * : from the s e v e r a l s l e e v e s a nd s h a f t s3 8 , 3 7 and 3 6 data f o r computing the wind c o rr e c t i o n , parallax correction a nd the s ound la gc o r r e c t i o n . For t h i s purpose there i s s h o w nn? mnt e d on the s l e e v e 38 (showing the b a s e l i n ea n g l e ) a cam 43 w h i c h introduces a function o ft h e a n g l e o f azimuth d e v i a t i o n , t h a t i s , thoughb etween the l i n e 13 connecting the sound l o c a t o rand Searchlight and h e line connecting th e soun dlocator and a p p a r e n t target ( l F i g . 1 ) Simil a r l y the cam 45 i s mounted on th e s l e e v e 37 1 ' 0 1 i n t r o d u c i n g a f u n c t i o n o f t h e a n g l e between thewind and the t a r g e t b e a r i n g l i n e ( 1 4 F i g . 1 ) .

' on, th at i s , i s p u s h e d one notch to the

L o v e y s - zTaking ? r s t t h e o e s e c t i o n e nd a s

suming fo r s m a l l angles that i t . . agent of t h eangle i s ap proximately th e some t . L e s i n e , thisc o r r e c t i o n may be shown t o be eppsoxtmetelye x p r e s s e d by t h e i o l l ow i n g e q u o t l o n :Esin0ainA_Bein5A os A It os A } .

Where s equals the p a r a l l a x c o r r e c t i o ne . equals the mtitude o f the t e r g e tB the b a s e l i n e h i si ? e q u a l s the azi mu th d e v i a t i o n s i n g l eA e q u a l s the e l e v s t i o n angleeuuols th e slant th e - '

sin-1x=

i si o n by f o n t s_1_w:A _

i s put i n t o the equation b y com. salon the5 w h i c h i s s h o w n as driven irom the shaft 8through the train o i shown in dotted l i n e set Z 2 . The slant r a ng e i s introduwd into t h em e c h a n i s m by the rod S" F i g . 3 } wh ich is shownm o v ing the s l i d e 3 3 l a t e r a l l y irom the smutrange m e c h e n i s m in l e v e r B . In Flgs?e a nd 5 ,however, the slant rouge i s introduced b y ther o t a t i o n o f the shaft S wh ich turns the groovede c c e n t r i c v s , thereby moving th e s l i d e E 3 l a t e ra l l y by the engagement o f the pin ' 2 5 on the s l i d ewith the s l o t in the e c c e n t r i c 7 4 . The m o v e m e n tor the cam 4 3 m o v e s up a nd down in 75 on rod7 6 wh ich pin takes i n a'slide-way 7 1 ' which i spositioned a t a n adjustable angle on her 78( F i g s . 5 a nd 8 ) . Th e angle o f the s l i d e 77 i sdetermined by an arm 7 9 carrying a r o l l e r 8 0at i t s e n d , which in turn engages in a , horizontalslide-way 81 on the rod 8 2 , wh ich i s m o v e d fromthe cam e l . S l i d e ' 3 3 i s , t h e r e f o r e , g i v e n e l a t e r a lmo vem ent dependent n o t o n l y upon t h e p o s i t i o no f the com to but else t h e position of thes ( i . e . sin 6 e nd e n s . n) .

This m o v e m e n t of s l i d e i s tum inpp e i ' t e d to move up e nd down the cross b a r

of

( A ? s :

This i s accomplished b y t h e pin secured tothe s l i d e 2e whic h engages i n a n s i n g u l a r l y advj u s t a b l e s l i d e - w a y 84 p i v o t e d on the c r o s s bar2 6 , t h e a n g l e b e i n g d e t e r m i n e d by t h e p o s i t i o no f t h e bar 7 3 ( B ) through t h e engagement o fr o l l e r 8 5 on an arm 8 6 secured to said slide-way8 4 . Th e output o f the d e v i c e , namely, the upa nd down m o v e m e n t o f the bar 2 6 v i s taken outthrough the l e v e r 87 ( F i g . 3 ) wher e i t i s c o m ~bined with the output o f the wind c o r r e c t i o nl a y e r output 27 a nd i s transmitted t o the ?nald i a l 20 showing the combined wind and p a r a l l a xazimuth orrection.Th e win d c o r r e c t i o n l a y e r i s very s i m i l a r i np r i n c i p l e and s o l v e s t h e f o l l o w i n g e q u a t i o n

Vain iKcocA

W h e r e y s t h e wind d r i f t a n g l eV he v e l o c i t y o f the windK he v e l o c i t y o f sounda n ; t h e a n g l e b e t w e e n t h e . t a r g e t and t h eA as before is the elevation a n g l e .

The i n i s introduced b y the cam 45 a nd1

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1 4 0

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' . l o o t i n g the v e r t i c a l rods 7d " a nduet ed f ro m t i m e cams may b e t he some esb e f o r e . Te e s l a n t h o w e v e r , i s n o t b r o u g h ti n t o t h i s e q u a t i o n b u t i n s t e a d t h e v e l o c i t y o fand a r e brought i n through t h e s e to f d i a l 1 ? ( F i g s . 3 e nd 6 ) wh ic h m o v e s rode c r e c t i l i n e e r l y through p imon 9 1 and r a c k t e e t hThis p o s i t i o n s t h e v e r t i c a l s l i d e - w a y 8 5 ' t overy t h e a n g u l a r p o s i t i o n o f t h e s l i d e - w a y 8 4

o i l y s i n f t o b i e l e e r ' 7 3 a nd t h u s t h e bero down on amount : : o p o r t i o n - =d d e v i t i o n a n g l e . As shown

3 , nowevei a r e t h r e e w ? ound wind role

i s i n t r o d u c e d

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' i i l o e r e i o r e i may use corn K l ? on sold s l ' r e i t 35 putting i n e , i i u i c t i o n o f A and a l t i t u d e i st i r e d e v i c e by the o i t i m e l z n o o 1 2 on' 5 1 : which through r e e l ; and p i n i o nmo v e s l i e s l i d e up and d o w n ( F i g s . 3 a nd e ) .A not s p r i n g c o may e p r o v i d e d between t h ea s e nd t h e bar 3% ( F i g . 1 l ) s o that the moon?e n i s r n w i l l not be damaged i n c a s e t h e maximums l e e t range f o r w h i ch the apparatus i s designed

is exceeded. The u p a n d down movement f thebar 34 t u r n s th e b e l l crank l e v e r 9 3 about i t s p i v o t99 on the pivoted arm i c e . Said p e r 98 i s a l s oprovided with . track-way in whic h the r o l l e r 95on rod 9d engages. Therefore, i t w i l l be seen thatth e arm we is rocked about i t s p i v o t 101 onamount p r o p o r t i o n e l t o t h e combined f u n c t i o n so f t h e e l e v a t i o n e n g l e ( A ) end a l t i t u d e , i . e . ,s l a n t range (R). 1 . 1 e output o f t h i s layer ( i t )imparted t o the ' through thee e t h a r e s hown i n i s a l s o import

ed t o r o t a t e spring r o l e o u t i t s p i v o t zsothe purpose o f entering i n t o t i e comput e t i o n o r t h e m o v e m e n t o f the t a r g e td r u i n g t h e t i m e i n t e r v a l , i s computedi n l a y e r 1 5 ( F i g . 3 ) . In h o w e v e r , tnetwol e y e r s 5 and e eresiiown s u p e r - i m p o s e d . T h i si s accomplished by moons o f a . smell gear s e c t o rwe secured t o the e we w h i ch m e s h e s withanother g e a r s e c t o r 1 G 3 s e c u r e d t o the s p r i n g a r m3 3 . This lee r s p r i n g , t h e r e f o r e , i s positionedi n . accordance with the s l a n t range ( R ) . Soldarm a r r i e s a t each e nd r o l l e r s ice-roe w h i chengage a n g u l a r - 1 y a d j u s t a b l e t r a c k - w a y s 1 0 5 - 1 0 6 .Said tregk-wgys a r e s e c u r e d t o s h a f t s 1 0 6 ' 1 0 6w h i c h . g i v e t u r n e d r e s p e c t i v e l y from t h e a z i m u t hsounding a c t u a t e d ? e x i b l e b e l l o w s 2 3 end t h ee l e v a t i o n sound l e g a c t u a t e d ? e x i b l e b e l l o w s 2 2 .Th e former i s s h o w n as actuated from 9 . r e v e r s ib l e suction or pressure pump ' dr iven from thes h a f t 8 ' a n d , t h e r e f o r e , r o t a t e d i n accordancewith the r a t e o f azimuth angular t r a v e l o f thesound l o o a t o r . Th e l a t t e r b e l l o w s 2 2 i s s i m i l a r l yactuated fro m a pump , driven from the e l e v at i o n s h a f t 2 through th e l a r g e g e a r 9 0 a nd p i n i o n9 1 , pump_9 b e i n g d r i v e n i n p r o p o r t i o n t o t h er a t e o f angular e l e v a t i o n o f t h e sound l o c a t o r .Fo r a f u l l e r d e s c r i p t i o n o f t h i s p a r t i c u l a r p o r t i o no f t h e a p p a r a t u s , r e f e r e n c e 1 5 h ad t o a p p l i c a n t scopending a p p l i c a t i o n N o . 3 7 2 , 7 7 7 , ? l e d June 2 1 ,1 9 2 9 f o r Me a n s f o r i n d i c a t i n g r a t e and d i r e c t i o no f movement. T h e p u m p s g e n e r a t e e i t h e r p o s i

t i v e o r n e g a t i v e p r e s s u r e according t o t h e i r d i r e ct i o n o f r o t a t i o n s o that the b e l l o w s e i t h e r expando r contract accord ing t o th e d i r e c t i o n o f r o t a t i o no f t h e pumps, t h e e x t e n t o f mo v e m e nt b e i n g p r oportionel t o the p u m p s speed, d ue to e constant leek i n each p u m p . On the s h o r t 1 0 6 i s securedt h e i n d i c a t i n g dim. 1 9 which i s , t h e r e f o r e , t h esound l e g i n d i c a t i n g azimuth d i a l ( 1 . e . , angularr a t e m u l t i p l i e d by t i m e e q u a l s a n g u l a r d i s t a n c e ) ,and t o t h e s h a f t ice" i s s e c u r e d the d i a l 1 % whic hi s , t h e r e f o r e , t h e sound l u g i n d i c a t o r d i a l i n e l e ~r e t l o n . With t h e s p r i n g 3 3 p o s i t i o n e d i n l i n e

th e s h e f t l i l o e nd r o e " , th e b e l l o w s 2 2 andw i l l o b v i o u s l y turn t h e c l i n i c i t and 3 . ; through l i n u r n eagle b e c a u s e v th e rotation o f the

-~ . u i s u n o p p os e d b y spring 3 5 . i n t h i s p oes l t i o o . t i r e d i a l s w i l l i n d i c e t e t h e soundl e g a n g l e . A s , h o w e v e r , t h e s p r i n g 3 3 i s r o t a t e dabout p i v o t 2 5 o . on i n c r e a s i n g f o r c e i s opposedt o t i r e expansion o r the bellows e nd i n that men-1nor the d l e l s indicate the rote in degrees per s e a ,o n d , m u l t i p l i e d by t h e two n s e c o n d s , which i s .o f c o u r s e , proportional t o the s l a n t range.s hown ( F i g s . 3 a nd 9 ) t h e i n d i c a t o r s 2 . 9end?o ar e placed s i d e by s i d e s o that the markon 2o ( p e r n l l e z r p l u s wind c o r r e c t i o n s ) erereed with respect t o on index 1 9 ' on 1 9 so thatt h e r e s - d i n g s o f t h e two d i a l s a r e thus o l g e b r e l c e li y a d d e d . The ? n a l r e a d i n g , t h e r e f o r e , g i v e st h e t o t a l c o r r e c t i o n f o r w i n d , p a r a l l a x and soundl e g . S l m i l e r l y t i i e r e i s mounted a d j a c e n t t h e d i a li t a second d i a l 2 1 f o r i n t r o d u c i n g t h e knowne r r o r i n e l e v a t i o n whic h s s e t i n by m e a n s i th eknob 2 1 ' whic h mey put i n t h e s p o t t i n g c o r r e c t i o n s .Th e t o t a l azimuth e r r o r i s then introduced i n t ot h e s y s t e m e u t o m e t i c o l l y o r by hand t h r o u g h t h es e t t i n g h a n d l e 1 0 , t h e o p e r e t o r r o t a t i n g t h i s mnd l e u n t i l t h e c o e r c e r e n d ?ne d i a l s 3 1 , 3 1 ' readthe s o m e a s the reeg f 19-20. Throught h e d i ? e r e n t i o i e r , t h i s t o t e l c o r r e c t i o n i s o l g e ~b r o l c e l l y edded t o the enimuth e n g l e o i t h e soundl o c e t o r which i s brought i n through s h a f t 8 andt h e ?nal c o r r e c t e d a n g l e t r a n s m i t t e d throught h e s h a f t 1 1 1 t o t r a n s m i t t e r 6 . S i m i l a r l y t h e o l eration correction indicated on d i a l s 1 s a nd 21are put in through handle l l s o that the courseand f i n e d i a l s 3 2 , 3 2 c o r r e s p o n d t o t h e r e a d i n g so f s o l d f i r s t mentioned d i a l s . This c o r r e c t i o n i sthen a l g e b r a i c a l l y added t o t h e e l e v a t i o n a n g l ethrough th e d i ? e r e n t i a l i 2 and t h e ?nal r e s u l ttransmitted t o the t r a n s m i t t e r 7 . There maya l s o be another s l i g h t c o r r e c t i o n i n e l e v a t i o n duet o the c o n s t r u c t i o n a l mounting o f the sound 1 0c e t o r g e a r s . and thismay be c o r r e c t e d f o r by d i f =f e r e n t l e l 3 0 , on e s i d e o f which i s d r i v e n from thes h a f t 2 and t h e o t h e r s i d e from t h e s h a f t 8through t h e g e a r i n g 1 1 2 , t h e outputof t h e d i ff e r e n t i a l d r i v i n g the s l e e v e 1 1 3 which d r i v e s on es i d e o f t h e d i ? e r e n t i a l 4 2 through g e a r i n g 1 1 4 .Th e ? n a l o u t p u t o f t h e t r a n s m i t t e r s _ 6 and ' lis l e d a s s h own i n F i g . 2 ? r s t ' t o wh at i s knownas a comparator from wh ic h the Searchlight iso p e r a t e d , a nd which compares o r matches t h et r a i n o f t h e sound l o c a t o r and S e a r c h l i g h t . Th ecomparator i s p r e f e r a b l y l o c a t e d a t a d i s t a n c efrom the sound l o c a t o r andsearchllght and hast h e r e i n a r e p e a t e r motor 1 1 4 a c t u a t e d from t h et r a n s m i t t e r 6 and r e p e a t e r motor 1 1 5 a c t u a t e dfrom t h e t r a n s n n t t e r 7 ( s e e a l s o F i g . 1 2 ) . Eachr e p e a t e r motor o p e r a t e s an i n d i c a t o r 1 1 6 - - 1 1 7which shows r e s p e c t i v e l y t h e p o s i t i o n o f t h e ysound l o c a t o r i n azimuth and i n e l e v a t i o n . Asecond p a i r o f i n d i c a t o r s 1 1 8 - 1 1 9 may be pro

3

l o l l

t o

3%

r e c

E 2 5

1 . 3 9

1 . 3 5

1 4 0

v i d e d f o r showing t h e azimuth and e l e v a t i o n o f 1 5 0


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4the s e a r e h l i g h t so that the o p e r a t o r s . b y m a t c hi n g the indexes on the two p a i r s o f i n d i c a t o r s .may keep the s e a r c h l i g h t pointed i n the properposition to illuminate th e t a r g e t . To this endt h e r e i s provided handwheels 1 4 1 , 1 4 1 ' f o r tuming the d i a l s 1 1 3 - 1 1 9 r e s p e c t i v e l y and f o r a l s ooperating th e connected t r a n s m i t t e r s 121-122w h i c h c o n t r o l the Searchlight from a distance inazi muth a nd in e l e v a t i o n .Th e azi mu th c o n t r o l i s s hown both in F i g .2 a nd i n F i g . 1 1 , the l a t t e r being on a largers c a l e and showing a l s o a s l i g h t l y m o d i? e d 'formo f the i n v e n t i o n . In t h i s ?gure the repeater mot o r 1 4 5 ( s e e a l s o F i g . 1 2 ) i s c o n t r o l l e d from

' transmitter 121 a nd in turn controls the torquea nd d i r e c t i o n o f a power motor M. My referredm e t h o d o f c o n t r o l i s by s h i f t i n g the r e l a t i v e p os i t i o n o f the brushes 125 o f t h e motor with respeettothe ?eldpolesandthisisshownasaccomplished by turning a gear 126 irom the motor1 4 5 ' . s a i d gear forming one arm of the dinere n t i a l gear T. T i h e other arm comprises agear 1 2 ' ? w h i ch i s on the samehnh s the interestgear 3 . 2 8 and driven f rom shaft 129 of the momt o r h f . p i n i o n s l 3 5 - 1 3 l . Th e planetarya r m o f s a i d geartrcin comprises the i r o n i c Fon w h i c h are mouriwd t h e b r u s h e s 125 and onwhich a l s o mounted the i n t e r - m e s h i n g pinione 139 and 1 3 d . one o i l which meshes w i t h t h egear 127 a nd the other with the gear 125 a ndwhich a l s o m e s h with each o t h e r . Th e p o s i t i o nof the brush , t h e r e f o r e , i s J o i n t l y controlled b ythe r e p e a t e r motor 1 4 5 ' and t h e power motorM o that the p o w e r m o t o r causes the eearchlightt o f o l l o w t h e movements o f t h e r e p e a t e r m o t o r ,and r e l i e v e s t h e r e p e a t e r motor o f a l l l o a d . Th epower motor is s h o w n as d r i v i n g the s e a r c h l i g h tthrough worm 1 3 1 ' on the shaft t h e r e o f d r i v i n gthe worm wheel 132 a nd pinion 1 3 3 w h i c h turnsthe l a r g e gear 134 on the base o f the searchlight. _I t w i l l be understood that the s e a r c h l i g h t i sc o n t r o l l e d i n elevation b y a similar m e c h a n i s mthrough pinion 160 on the shaft motor M wh ich

~ a segmental gear 161 on the trunnionh e s e a r c h l i g h t ( 1 ' 1 8 . 2 )s i m p l e s t form o f the apparatus showni n 1 2 wh ere d i r e c t current step-by-stepm e t e r s are e mplo ye d i t i s necessary to h a v e s o m em e a n s i o r synchronizing the apparatus a nd t oend I have shown s i g n a l l i g h t s 140-140 a tthe sound l o c a t o r a nd 1 4 1 - 1 4 1 at the computer.The ?rst mentioned pair ofllghts are c o n t r o l l e dr e s p e c t i v e l y by s w i t c h e s 142-442 governed byc a m s 143 on the shafts of the repeater motors114-115. These switches are designed to beclosed b y the c a m s when he indicators read zeroso that the operators crank the transmittersaround u n t i l the l i g h t s l i g h t and then by h and l e s G and H hey turn the sound l o c a t o r t opoint north and h o r i z o n t a l . S i m i l a r l y the comp a r a t o r o p e r a t o r s t u r n t h e c r a n k s 1 7 2 0 - 4 2 1 u n t i lt h e lamps 141-441 a r e l i g h t e d w h e n t i s knownt h a t t h e sound l o c a t n r , comparator and searchl i g h t are a l l pointing in the s a m e d i r e c t i o n a ndsynchronized. _

I f desired a more or l e s s self-synchronous systemmay e e m p l o y e d instead of t h e s y s t e m shownin F i g . 1 2 . F i g . 1 3 shows the use o f alternatingc u r r e n t Selsyn t r a n s m i t t e r s and m o t o r s , whichs y s t e m i s p a r t i a l l y s e l f - s y n c h r o n o u s . A c c o r d i n gt o t h i s system the Selsyn transmitter 6 i n a z imuth a nd ' l ' in elevation actuate as h e i o r e , therepeater motors 1 1 4 and 1 1 5 a nd the transmitt o r s 1 2 1 ' 1 2 $ actuate the elevation a nd a z i ~ = '

. 1,978,727m u t h r e p e a t e r motors 1 4 2 5 ' 1 4 6 . i n the searchl i g h t , the l a t t e r s h i f t i n g the brushes o f the powermotors M-M' s b e f o r e . In order t o gain acc u r a c y , however, i n the S e a r c h l i g h t c o n t r o l t h etransmitters 1 2 1 ' a nd 1 2 2 ' are not connected "onet o one" t o th e sending instrument but are-gearedu p thereto as indicated by the gearing 1 4 8 - 4 4 8 which, o f courm, d e s t r o y s self-wnchronism.Therefore it is d e s i r a b l e to h a v e a synchronousrepeat back system from the S e a r c h l i g h t t o thecomparator a nd t h i s i s provided b y the coarse o rone-to-one transmitters ice-15c on the searchl i g h t wh ich actuate the coarse repeater motors151-151 a t the comparator, which thus r e p l a c et h e answer-heck l i g h t s .1 5 is i d e n t i c a l i n p r i n c i p l e with F i g . 1 3except that i n p l a c e o f u s i n g ?ne Selsyn t r a n s m i t t e n s a nd motors irom the comparator t o thes e a r c h l i g h t I employ t h e s t e p i - h y q t e p t r a n s m i t h e r s 1 : 2 1 a nd i 2 2 3 as in i2 a nd the steps t e p r e p e a t e r motors and M5. t i "i o r e , comhincs th e eeliwsynehroncne i t o w wh ich i s used the soundomparator, a n 7 e r ~ h e c l r fromi g h t t o the c o m p a n i e s with s t w h y - ss y s t e m need the control cpainter t o t h e S e a r c h l i g h t . This system 1 , 5 , 1 .t a i n advantages s i n c e m a t e r i a l t o r q u e i s r e q u i r e dt o the brushes o i the motor f o r whic h thes t e p - h y - s t e p motors a r e better a d a n t e d t h a n .S e l s y n m o t o r s .A o m p l e t e l y s e l f - s y n c h r o n o u s system i s s h o w n .i n F i g . 1 4 . In t h i s ?gure t h e r e i s employed a tthe sound loeator coarse a nd ?ne a z i m u t h transmitters 206-206' a nd coarse and ?ne elevationtransmitters 207 a nd 2 0 7 ' . Since the system i sc o m p l e t e l y s e l f - s y n c h r o n o u s t h e a n g l e s t r a n s .mitted may be l e d d i r e c t l y t o the s e a r c h l i g h twithout g o i n g : through a comparator. There~f o r e , w h e n the double-throw switch 1 6 0 i s thrownto the l e f t , in F i g . 1 4 , the a f o r e s a i d coarse a ndf i n e transmitters are connected r e s p e c t i v e l y tothe coarse a z i m u t h repeater motor 245 a nd coarsee l e v a t i o n - r e p e a t e r motor 24 6 on the s e a r c h l i g h t ,while th e f i n e transmitters 2 0 6 ' a nd 2 0 ' ! " are c onnected r e s p e c t i v e l y t o t h e f i n e a z i m u t h r e p e a t ermotor 1 4 5 ' and ?ne e l e v a t i o n r e p e a t e r motor 2 4 7 on the s e a n e l ' i l i g l i t . v In accordance with the syst e r n d i s c l o s e d i n my p r i o r Patent No. 1 , 8 6 2 , 0 1 7f o r Distant c o n t r o l m e c h a n i s m s dated June 7 .1 2 3 2 , ' t h e s e a r ' c h l i g h t i s normally c o n t r o l l e d fromthe ?ne motors M5 and 2 4 ? whic h t u r n thebrushes of th e p o w e r motors M s heretoforeoutlined. The a z i m u t h coarse m ot or on th eother hand s m o u n t e d on the base o f the searchl i g h t a nd the armature thereof c a r r i e s a t r o l l e y1 8 2 ( F i g . 1 1 ) which normally c o n t a c t s with thei n s u l a t e d segment 1 6 3 between two l i v e segments164165, t h e r i n g c a r r y i n g s a i d segments b e i n gstationary on shaft 2 1 1 . Said l i v e segments arein c i r c u i t with the r e v e r s i b l e power motor 1 6 6so that i f the Searchlight should g e t ou t o f sync h r on is m with the s ound locator t o s uc h a n ext e n t that the angle exce eds t h e angle subtendedby the s e c t o r 1 6 3 , th e power motor 1 8 6 i s broughti n t o operation t o overcome the Selsyn motor 1 4 5 'a nd r e s t o r e the Searchlight within the l i m i t s o fsynchronism o i the f i n e motor. Th e e l e v a t i o nc o n t r o l i s i d e n t i c a l through motor M , e t c . Th eazi mu th c o n t r o l i s i n d i c a t e d i n F i g . 1 1 , i t beingund e rs too d that coarse motor 24 6 a nd i t s cont a c t s are i d l e when the s e a r c h l i g h t i s employedin connection with the form o f transmissions h o w n . i n t h e preceding ? g u r e s .As soon as the s e s r c h i i g h t has been brought

H0

H5

1 3 0

135

140

145

3 5 6


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1 , 9 1 6 , 7 2 1 near t h e timeahe soundlocatorit may bed e s i r a b l e t o s w i t c h t h e c o n t r o l t o t h e c o m p a r a t o ror other manual d e v i c e s o as t o f o l l o w t h e t a r g e tby s i g h t ; T h i s m a y b e e ? e c t e d e a s i l y by throwi n g t h e m u l t i p l e - p o l e s w i t c h 1 6 0 i n t o t h e p o s i t i o nshown i n ' l l ' i g . 1 4 ' when t h e s e a r c h l i g h t i s con

t r o l l e d from the a u x i l i a r y coarse and ne azimuth

I .and e l e v a t i o n t r a n s m i t t e r s 1 7 0 1 7 0 ' - 1 7 1 - , 1 7 1 ,which t w i l l b e u n d e r s t o o d a r e t u r n e d by c r a n k s12oand121. 1 v , .. A s a b o v e s t a t e d t h e computer shown i n F i g . 8 .does-not attemp tjto co mpute w ind error in eleva-t i o n or p a r a l l a x e r r o r i n e l e v a t i o n , s i n c e t h e s equantitiesare s o small as t o be n e g l i g i b l e within

55

7 0

' t h e l i m i t s o f e r r o r o f the remai'nderof the a pp a r a t u s . For v e r y a c c u r a t e w o r k , h o w e v e r , i t .may e d e s i r a b l e t o ' i n c l u d e t h e s e c o r r e c t i o n s . andi n F i g . 1 0 I have shown d i a g r a m m a t i c a l l y h owa l l c o r r e c t i o n s m a y be i n t r o d u c e d a u t o m a t i c a l l y .I n t h i s ? g u r e , l a y e r s 8 , 4 , b a n d 6 p e r f o r m t h es a m e functions in the same manner as the corr e s p o n d i n g l a y e r s i n F i g . 8 , n a m e l y , t h e y i n t r oduce r e s p e c t i v e l y t h e wind c o r r e c t i o n i n a z i m u t h .p a r a l l a x c o r r e c t i o n i n a z i m u t h , and sound l a gc o r r e c t i o n i n azimuth and i n e l e v a t i o n and ?nalL v comput th e t o t a l e r r o r s i n azimuth and e l e v at i o n . In F i g . 1 0 , however, I have two o t h e rl a y e r s , l a y e r 1 w h i c h c o m p u t e s t h e wind c o r r e c f .t i o n . i n e l e v a t i o n and l a y e r 2 which computes t h ep a r a l l a x c o r r e c t i o n i n e l e v a t i o n . Th e l a t t e r i scomputed i n a c c o r d a n c e w i t h t h e e q u a t i o n .

h w y - B o s l v z s i n Aw h e r e t h e s y m b o l s l r e p r e s e n t t h e same a n g l e s - a sb e f o r e . This computation i s e f f e c t e d i n v l a y e r - 1 2from t h e cams 4 3 ' and 4 4 ' , l a y e r 2 b e i n g c o m - ,b i n e d w i t h l a y e r o s o t h a t t h e r e i s a l s o c o m p u t e dh e r e i n t h e s l a n t range R . S i m i l a r l y t h e windc o r r e c t i o n i s computed i n l a y e r 1 f r o m - t h e camsa s a u d i o i n a c c o r d a n c e w i t h t h e e q u a t i o n

' Vcosdoind I s i r r ' y '- x~ w h e re the symbols ha ve-the samemeanmg s i nt h e p r e v i o u s e q u a t i o n s . Th e summation o f t h eazimuth c o r r e c t i o n from l a y e r s - 3 and 4 i s t r a n sm i t t e d t o t h e d i a l Z i i a n d t h e s u m m a t i o n o f t h ee l e v a t i o n c o r r e c t i o n from l a y e r s 1 and 2 i s t r a n s .mltted t o the d i a l - 2 1 . layer 6 remains a s b e f o r ee x c e p t t h a t the d i a l 2 1 is s e t a u t o m a t i c a l l y fromt h e e l e v a t i o n c o r r e c t i o n i n s t e a d o f through t h eMob 1 .There i s a l s o shown i n t h i s ?gure a simpli?edm e t h o dof i n i t i a l l y s e t t i n g t h e c a m s h a f t s 3 6 - 3 7a nd 3 8 . In t h i s i n s t a n c e the innermost s h a f t 3 8i s s e t by m e a n s o f t h e d i a l 5 0 ' , the i n n e r s l e e v e3 7 by t h e p o i n t e r 2 9 ' and t h e o u t e r s l e e v e 3 8 byt h e p o i n t e r 2 8 ' , a l l o f which a r e l o c k e d i n p o s it i o n by s e t screws ( n o t shown) a f t e r being s e t .Th e remainder o f t h e a p p a r a t u s v f u n c t io n s s u bs t a n t i a l l y a s d e s c r i b e d i n F i g . 3 and t h e d e s c r i pt i o n need not be r e p e a t e d , t h e p a r t s b e i n g g i v e nc o r r es p onding numbers throughout. There are, h o w e v e r , numerous sources of error

i n e l e v a t i o n w h i ch cannot be c a l c u l a t e d , such asthe wind r e f r a c t i o n e r r o r a nd the temperaturerefraction error so that the errors in e l e v a t i o n ,e v en i f co mpute d f o r w ind d r i f t a nd p a r a l l a x , areu s u a l l y l a r g e r than t h o s e i n a z i m u t h . For t h i sreason I p r e f e r not t o attempt t o compute thee l e v a t i o n e r r o r s e x c e p t the sound l a g . e r r o r butt o compute a c c u r a t e l y t h e azimuth e r r o r s , t h e r eby l i m i t i n g t h e f i e l d o f s e a r t h o f t h e s e a r c h l i g h tt o a s u b s t a n t i a l l y v e r t i c a l p l a n e o r l i n e . I t i s

' t u d e o f t h e - p l a n e ' ( A ) .

5f o u n d t h a t a n - a i r c r a f t c a n b e p i c k e d v up v e r yq u i c k l y when t h e ? e l d o f s e a r c h i s s o l i m i t e d .

. The operationof my device i s as f o 1 l o w s : _ Ins e t t i n g upthe c o m p u t e r f o r o p e r a t i o n t h e d e v i c ei s s y n c h r o n i z e d by b r i n g i n g t h e sound l o c a t o r and s os e a r c h l i g h t t o p o i n t n o r t h and h o r i z o n t a l w h i l ebringing a ll d i a l s t o . z e r o as explained a b o v e . Then. t h e d i a l s o f t h e computer a r e s e t as f o l l o w s : "

( l ) D i a l 2 8 i s s e t f o r th e d i r e c t i o n with r e s p e c tt o north o f ' t h e b a s e l i n e LS etween t h e sound 1 0 - 8 cator and earchlight. 4 , _

( 2 ) The d i a l 2 9 i s s e t f o r the d i r e c t i o n o f thewind (o). > -. ( 3 ) Th e d i a l s l 5 and 1 8 a r e s e t f o r t h e groundv e l o c i t y o f t h e wind and t h e e l e v a t i o n v e l o c i t y - . of the wind respectively (V). _ a '

( 4 ) The d i a l - 1 2 i s s e t f o r the estimated a l t l :- The d i r e c t i o n andvelocity o f t h e wind a r eg i v e n by t h e m e t e o r o l o g i c a l s t a t i o n s and th el t i t u d e o f t h e p l a n e i s e s t i m a t e d by t a k i n g i n t o a c c o u n t t h e a t m o s p h e r i c c e i l i n g . t y p e o fp l a n e , and t h e a n g u l a r . e l e v a t i o n when ? r s t h e a r d . Th e . f o r m u l a f o r determining t h e . c o r - - 'r e c t i o n s i s s u c h t h a t e r r o r s i n t h e making 0 1 6 1 0 0e s t i m a t i o n f o r v a l t i t u d e are r e l a t i v e l y unimp o r t a n t , t h e mo s t important f a c t o r i n t h e c o rr e c t i o n being the angular v e l o c i t y o f the t a r g e t .Th e sound l o c a t o r i s then b r o u g h t t o b e a r upont h e s o u n d s c o m i n g from t h e t a r g e t and i s kept-m5

v on s u c h target b y th e listeners at E and . ~ . Theangular v e l o c i t y i n azimuth and e l e v a t i o n i sd e t e r m i n e d a u t o m a t i c a l l y from t h e r a t e a t whichthe sound l o c a t o r i s mo v e d i n f o l l o w i n g t h e a tt a c k i n g v a i r c r a f t . T h i s r a t e , c o m b i n e d w i t h t h ef o u r s e t t i n g s m e n t i o n e d a b o v e , a u t o m a t i c a l l yg e n e r a t e s t h e n e c e s s a r y c o r r e c t i o n s , t h e t o t a lo f which i s a u t o m a t i c a l l y i n d i c a t e d and cont i n u o u s l y a p p l i e d t o t h e a n g l e which t h e soundl o c a t o r t r a n s m i t s t o . t h e comparator a t t h e c o n - "5

1 , 1 1 0

t r o l s t a t i o n . The true position of the attacking a i r c r a f t . i s thus designated at the c o m p a r at o r a nd the a e a r c h l i g h t i s brought t o bear upon,the t a r g e t . Th e e r r o r s a r e such that i t i s o n l yn e c e s s a r y . f o r a s e a r c h l i g h t o p e r a t o r " t o . sweephrough a n area o f e v e r y fe w d e g r e e s in e l ev a t i o n t o p i c k up t he . t a r g e t , and t h i s s w e e p i n goperation can be accomplished-within a fe w s e co n d s . -As soon as the t a r g e t i s picked u p t h es e a r c h l i g h t may, o f c o u r s e ; be c o n t r o l l e d d i r e c tl y v f r o m t h e h a n d l e s 1 4 1 and 1 4 1 ' w i t h o u t r e f e rence t o the sound l o c a t o r p o s i t i o n .

In a c c o r d a n c e with t h e p r o v i s i o n s o f t h e p a t e n ts t a t u t e s , I have h e r e i n d e s c r i b e d t h e p r i n c i p l eand o p e r a t i o n o f my n v e n t i o n . t o g e t h e r w i t h t h e noapparatus which I now c o n s i d e r t o r e p r e s e n t t h eb e s t embodiment t h e r e o f , but I d e s i r e t o havei t u n d e r s t o o d t h a t t h e a p p a r a t u s shown i s o n l yi l l u s t r a t i v e and that the invention can be c a r r i e do u t by o t h e r means. A l s o , w h i l e i t i s d e s i g n e dt o use the v a r i o u s f e a t u r e s and elements in thecombination and r e l a t i o n s d e s c r i b e d , some o f .t h e s e may e a l t e r e d - a n d o t h e r s o m i t t e d w i t h o u ti n t e r f e r i n g with t h e more g e n e r a l r e s u l t s o u tl i n e d , a nd the invention extends t o such u s e .

Having d e s c r i b e d my n v e n t i o n , what Ind d e s i r e t o s e c u r e by L e t t e r s Patent i s :1 . A y s t e m f o r l o c a t i n g a i r c r a f t a t n i g h t com

p r i s i n g a sound l o c a t o r , a S e a r c h l i g h t , m e a n s f o r 1 4 5p o s i t i o n i n g t h e s e a r c h l i g h t i n a c c o r d a n c e witht h e p o s i t i o n o f t h e sound l o c a t o r . an automaticc o r r e e t i o n d e v i c e a c t u a t e d p r i m a r i l y from s a i ds o u n d l o c a t o r f o r c o n t i n u o u s l y c o m p u t i n g t h esound l a g e r r o r , and means f o r i n t r o d u c i n g s a i d 1 5 0

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6c o r r e c t i o n i n t o s a i d s e a r c h l i g h t p o d t i o n i n gmeans. .2 . A ystem f o r l o c a t i n g a i r c r a f t a t night comprisi nga sound l o c a t o r , a s e a r c h l i g h t , m e a n s f o rp o s i t i o n i n g . t h e s e a r c h l i g h t i n accordance withthe p o s i t i o n o f the sound l o c a t o r , an automaticc o r r e c t i o n d e v i c e actuated p r i m a r i l y from s a i dsound l o c a t o r f o r c o n t i n u o u s l y computing the

. - sound la g e r r o r , the parallax error and th e w i n d10

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e r r o r , a n d m e a n s f o r introducing a l l o f s a i dc o r r e c t i o n s i n t o s a i d s e a r o h l i s h t p o s i t i o n i n gmeans.3 . A system f o r l o c a t i n g a i r c r a f t a t night comprising a s ound l o c a t o r . a s e a r c h l i g h t , means o rcomputing the p a r a l l a x e r r o r i n azimuth, m e a n sf o r computing the wind i n azimuth, m e a n s f o rcomputing thegound l a g e r r o r i n azimuth and i ne l e v a t i o n , a l l o f s a i d m e a n s being primarily actuated from said sound l o c a t o r , a nd m e a n s f o rc o n t i n u o u s l y t r a n s m i t t i n g c o r r ec t e d sound l o c a t o ra z imut h a nd e l e v a t i o n angles including m e a n sf o r introducing the a f o r e s a i d computed e r r o r s .4 . Means f o r computing c o r r e c t i o n s f o r p o s itioning searchlights from sound locator unitsi n c l u d i n g the combination with the sound l o c at o r a n d m e a n s f o r positioning the s a m e i n a z im u t h and e l e v a t i o n , computing m e c h a n is m a c t u ~ated by the angular movements o f the soundl o c a t o r f o r computing the sound l a g e r r o r i n botha z imut h a nd e l e v a t i o n , m e a n s f o r computingt h e azimuth p a r a l l a x c o r r e c t i o n t o compensatef o r the spacing o f the sound l o c a t o r a nd searchl i g h t , m e a n s f o r computing the s l a n t range fromthe a l t i t u d e o f the target a nd a function o f thea n g l e o f e l e v a t i o n o f t h e sound l o c a t o r , a ndmeans for introducing said slant range as a ,m ea sur e of time in both the a z i m u t h a nd elevat i o n sound l a g m e c h a n i s m s t o g i v e th e component sound la g e r r o r s a nd as a function in theazi mu th parallax c o r r e c t i o n means.5 . Means f o r computing c o r r e c t i o n s f o r p o s it i o n i n g s e a r c h l i g h t s from sound l o c a t o r u n i t s i ncludingthe combination with the sound l o c a t o ra nd means o r positioning the s a m e i n a z i m u t hand e l e v a t i o n , m e a n s actuated by the angularm ove m en t s o f the sound l o c a t o r f o r g e n e r a t i n g t h e angular r a t e s o f m o v e m e n t thereof i n a z im u t h a nd e l e v a t i o n , m e a n s actuated by t h e a z im u t h p o s i t i o n o f the sound l o c a t o r f o r computi n g t h e p a r a l l a x c o r r e c t i o n t o compensate f o r t h espacing o f the sound l o c a t o r and s e a r c h l i g h t ,m e a n s f o r . co mputing the s l a n t range from thea l t i t u d e o f the t a r g e t and a function o f the angleo f e l e v a t i o n o f the sound l o c a t o r , a n d m e a n s f o rintroducing said slant range as a m e a s u r e oftime i n both the a z imut h a nd e l e v a t i o n r a t emechanisms t o g i v e t h e component sound l a gerrors and as a function in th e a z i m u t h parallaxcorrection m e a n s .6 . Means f o r computing c o r r e c t i o n s f o r p o s it i o n i n g s e a r c h l i g h t s from sound l o c a t o r i m i t s i nc l u d i n g t h e combination with t h e sound l o c a t o ra n d m e a n s f o r p o s i t i o n i n g th e s a m e in azimuthand e l e v a t i o n , computing mechanism a c t u a t e dby the angular mo v e m e nt s o f the sound l o c a t o rf o r co mputing the sound lag error i n both a z imuth a nd e l e v a t i o n , m e a n s f o r computing theazimuth p a r a l l a x c o r r e c t i o n t o compensate f o r

1 , 9 7 0 , 7 2 7the spacing o f the sound l o c a t o r and searchl i g h t , m e a n s f o r computing the s l a n t range fromthe a l t i t u d e o f the target and a function o f thea n g l e o f e l e v a t i o n o f the sound l o c a t o r , a ndmeans fo r introducing said slant range as am ea sur e of time i n a t l e a s t the azimuth sound l a gm e c h a n i s m s t o g i v e the component sound l a gerrors and as a function in the a z i m u t h parallaxcorrection m e a n s .' 1 . Mea n s f o r computing c o r r e c t i o n s f o r p o s it i o n i n g s e a r c h l ig h t s from sound l o c a t o r u n i t s i nc l u d i n g t h e combination with t h e sound l o c a t o ra nd m e a n s f o r p o s i t i o n i n g the s a m e i n a z imut hand e l e v a t i o n , m e a n s actuated by the angularm o v e m e n t s o f the sound l o c a t o r f o r generatingthe angular r a t e s o f m o v e m e n t t h e r e o f i n a z i - 'mu th , m e a n s actuated by the uth p o s i t i o no f the sound l o c a t o r f o r c o m p u ing the parallaxc o r r e c t i o n t o compensate f o r t h e s p a c i n g o f t h esound locator a nd s e a r c h l i g h t , means for computing the s l a n t range from the a l t i t u d e o f thet a r g e t a nd a function o f the angle o f e l e v a t i o no f the sound l o c a t o r , a nd m e a n s f o r introducing said slant range as a m e a s u r e of t i m e inthe a z imut h r a t e m e c h a n i s m t o g i v e the component sound lag error and as a function inthe azimuth p a r a l l a x c o r r e c t i o n m e a n s wh erebythe f i e l d o f search i s l i m i t e d t o a l i n e insteado f a t h r e e dimensional s e a r c h .8 . In a sound l o c a t o r , m e a n s f o r co mputingt h e angular c o r r e c t i o n f o r sound l a g comprising means for c om p u t ing the s l a n t range, m e a n sf o r generating the angular r a t e o f m o v e m e n to f the sound l o c a t o r i n azi muth a nd i n e l e v a t i o n ,and means of co mb i n i ng a function of said rangea nd the azimuth a nd e l ev a t i o n r a t e t o g i v e theangular c o r r e c t i o n i n azimuth and e l e v a t i o n .9 . In an a i r c r a f t sound l o c a t o r movable i nazimuth and e l e v a t i o n , m e a n s f o r computing thea n g u l a r c o r r e c t i o n s f o r sound l a g c o m p r i s i n gmeansv for combining the e l e v a t i o n angle anda l t i t u d e of the craft for slant range, means forg e n e r a t i n g the angular r a t e o f m o v e m e n t o f t h esound l o c a t o r i n a z imut h and e l e v a t i o n , andmeans for co mb i n i ng a function o f said rangewith each o f s a i d r a t e s t o g i v e both componentso f the angular c o r r e c t i o n .

1 0 . In a s y s t e m for ?ashing a searchlight ona i r c r a f t a t n i g h t , the combination with a soundl o c a t o r a nd remotely p o s i t i o n e d s e a r c h l i g h t andm e a n s f o r turning each i n a z imut h a nd e l e v a t i o n ,angle transmitting m e a n s actuated by the tuming o f the sound l o c a t o r t o d i r e c t the searchl i g h t , and c o r r e c t i o n mechanism f o r c o r r e c t i n gthe transmitted angles including m e a n s p o s i t i o nable i n accordance with a function o f the angleb et ween the sound locator a nd the baseline between the s e a r c h l i g h t a nd sound l o c a t o r , m e a n spositionable i n accordance with a function o f theangle be tw e en the wind a nd s a i d b a s e , m e a n sp o s i t i o n a b l e i n accordance with a function o f thee l e v a t i o n angle o f s a i d sound l o c a t o r , m e a n sp o s i t i o n a b l e i n accordance with th e a l t i t u d e , ap l u r a l i t y o f mechanical m e a n s actuated therebyf o r computing the sound l a g angle a t l e a s t i nazimuth, the p a r a l l a x angle a nd the wind co rrection a n g l e , a n d m e a n s for introducing saidc o r r e c t i o n i n t o th e transmitted a n g l e s .

FRANK . HOUSE.

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Military Searchlight Computer (1930)