The Wild T1 Theodolite

The wild T1

Theodolite

<Measurement reference mark

To measure hi

To measure slope and horizontal distances from head in direction of telescope pointing possible Pythagoras effect on short distances

Ref.mk.

\/

T1 Ref Marks

T1 cutaway

^Alidade part^

The H-circle<Rigid attachment to circle (XX)

\/ Leveling head \/

Upper^

Circle

Lower\/

T1 schematic

T1 labeled parts

T1 schematic grayscale

The WILD T1 Theodolite

In left face position

Preparing to zero the Instrument

Left face

<<<Note the exterior zero reference

Upper lock knob (clamp)

Exterior Zero 1

Exterior Zero 2

Use upper Lock knob (clamp) to fix in this position

Exterior Zero 3

The

Micrometer knob

The micrometer knob

The micrometer sweeps the circles allowing a refinement of the reading (optical mechanical)

providing for precise reading

<Graduations on the circle these divisions are the least count of the circle

The micrometer divides up the divisions on the circle providing a more precise least count for the system >

Utilizing a direct reading

The micrometer knob does not change the orientation of the theodolite it effects only <internal motions

Micrometer schematic

Adjust mirror to illuminate the view of the circles

mirror

Mic ex 1

Mic ex 2

The micrometer eyepiece

The telescope eyepiece

eyepieces

Mic eye 1

Mic eye 2

Micrometer coming into view through microscopic micrometer eyepiece

Mic eye 3

Note that setting the exterior zero mark has gotten us close to a zero in the Hz window

We must now use the micrometer knob to zero the micrometer

Zeroing 1

Turn the micrometer knob till we get >

Zeroing 2

Turn the upper slow motion tangent screw till we get coincidence >>>

Now the horizontal circle is zeroed and we need to carry this reading to our BS

Zeroing 3

Vertical lock

Optical Plummet eyepiece

Lower Horizontal lock knobUpper slow motion tangent screw

Lower slow motion tangent screw

Upper Horizontal lock knob >>

Vertical slow motion screw >>

The upper horizontal lock clamps the alidade and the H-circle together

The upper slow motion screw provides slow controlled incremental motion between the alidade and the H-circle

The knobs 1

Vertical lock

Optical Plummet eyepiece

Lower Horizontal lock knobUpper slow motion tangent screw

Lower slow motion tangent screw

Upper Horizontal lock knob >>

Vertical slow motion screw >>

The lower horizontal lock clamps the H-circle and the leveling head together

The lower slow motion screw provides slow controlled incremental motion between the H-circle and the leveling head

The knobs 2

With the upper clamp still locked to maintain our zero setting

make sure the lower clamp is unlocked

Point the telescope in the general direction of our BS target

Be very careful to not disturb the upper locking clamp or slow motion tangent screw

BS 1

We may use the peep sight to get close

BS 2 peep sight

The target is in view and we now need to lock the lower clamp and use the lower slow motion screw to put the cross hairs on our target

We may also lock the Vertical clamp and use the Vertical slow motion if we wish to control the up and down motion

Cross hair close BS 1

<Lower lock

Lower slow motion screw>

Vertical clamp (lock)>

Vertical slow motion>

The knobs 3

We are now sighted in on our BS target with zero on our circle

Cross hair on Bs 1

Upper Lock/Clamp>

Upper slow motion tangent screw>

We should now unlock the upper clamp

So that we can turn over the circle and point to the FS target

The knobs 4

Turn to the FS get close with the peep sight

Lock the upper lock knob

Use the upper slow motion tangent screw to get an accurate pointing

If you are also reading the vertical circle you must use the Vert. Clamp and slow motion screw

FS target >

<micrometer knob

<Vertical clamp

<vertical slow motion screw

<Upper horizontal lock/clamp

FS 1

Using the peep sight

FS 2

Close to target we may now use the upper horizontal slow motion screw and the vertical slow motion screw to get on target

Cross Hair close FS 1

Are the cross hairs on target

You be the judge

Cross Hair on FS 1

We now need to adjust the micrometer knob to accomplish reading

FS 1 H mic 1

Turning the knob

FS 1 H mic 2

1) Do we have coincidence ? You be the judge!

2) Hz Reading = 39°47’03” Do you agree?

3) Now to get V reading we need to readjust the micrometer knob

To get coincidence in the v window

FS 1 H mic 3

The vertical circle readings are referenced to gravity

And the T1 has an Auto Compensator

So we do not have to adjust any bubbles before reading like we might have to on some other instruments

Auto compensator 1

Auto compensator 2

Looks a little fuzzy – maybe we should have adjusted the micrometer focus

Do we have coincidence in the v box?

V Reading = 92°25’00” Do you agree ?

FS 1 V mic 1

Now we must plunge the telescope

To double our angle on RF

Plunge 1

Going

Plunge 2

Going

Plunge 3

Plunge 4

Going

Plunge 5

Gone <lower slow motion

Plunge 6

<lower H-lock

Lower H-slow motion>

We should now unlock the lower clamp so that we can carry the previous Hz reading to the BS

RF BS 1

Using the peep sight to get close to the BS

RF BS 2 peep sight

Lock the lower clamp and use the lower slow motion screw to precisely acquire the BS target

You should now be on the target and the Hz value should not have changed

RF BS cross hair on

We can now unclamp the upper lock knob and turn the telescope to point in the direction of our FS target

RF FS 2 rough sight

RF FS 2 peep sight

Using the peep sight

RF FS 2 cross hair

With the upper clamp now locked use the upper slow motion tangent screw to precisely acquire the FS target in RF

We must now turn the micrometer knob until the double lines in the Hz box are bisected by the single degree line from the horizontal circle

RF FS mic 1

There does this look like we have coincidence?

If so our Hz reading is 79°33’56” Do you agree?

Now lets reduce our observations are they reasonable?

RF FS mic 2

We then readjusted the micrometer knob to get a reading on the vertical circle.

Perhaps we could have done a better job of setting coincidence?

But we will take our reading anyway (for demonstration purposes).

V reading = 267°35’03” Do you agree?

RF FS mic 3 V

Now lets put the instrument away

Line up the red dot and red line

Lightly touch …the two… H-clamps to lock

Put away 1

Put away 2

Into the bottom part of the bullet can canister

Note the resting places for specific parts

Put away 3

Apply clamps to lock theodolite into the bottom part

Put away 4

Snap canister lid on

Put away 5

Place in foam padded travel case

Put away 6

All ready to travel or put away