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TESLA ELECTRON MICROSCOPE-Desk Model BS 243Guaranteed
Local Service
Installationand
InstructionIncluded in Price
FEATURES* Resolving power 30A to 50A in routine operation, opti-
mal resolution 25A* Magnification 1,OOOX to 30,000X, adjustable in steps
* Accelerating voltage 60 kV ±0.01%* High-voltage stability better than 10', ripple less than
2.5 x 10-5* Specimen inserted under vacuum
* Specimen motion controlled from microscope platform
* Microscope may be tilted for stereo-photography* Viewing port usable for diffraction patterns* Uses standard 35 mm film (36 pictures) or ten 2" x 2"
plates* Dimensions of basic instrument: 141/2" wide, 18" deep,
341/2" high* Low initial cost and minimal maintenance
Made inCzechoslovakia
WorldwideDistribution
For Complete description,technical data,
and ordering information,write for BULLETIN 8-2000
by by EXCLUSIVE SALES AND SERVICE IN U.S.A.
AOYO NATIONAL INSTRUMENT LABORATORIES, Inc.828 Evarts St., N.E., Washington 18, D. C. Tel.: NOrth 7-7582
758 SIENC, VO. 13
The LittleGiant
60 kV30,OOOX30A
.1
SCIENCE, VOL. 132758
worth a thousand words... iLet your students see science in actiomfor themnselves iwith these laboratory-provededucatio'nal instram)ents byBausch, & Lo))mb. They'll uncderstandcbetter, faster-be eager.to lear)n more.
B&L STANDARD TEACHING* MICROSCOPES. Standald size and operation; sturdy,
precision construction at school budget prices. ! B&L STEREOZOOM* MICROSCOPES with
continuously var iable or fixed magnification. Colorful, erect 3-D images give new life to any subject.
' B&L MACROSCOPES* are ideal for gross studies, field trips, dissection. Easy focus, large
fielcl of viewv with 10 x, 20 x, or 40 x magnification. TRI-SIMPLEX* MICRO-PROJECTOR
prepares students for individual microscope study. Projects slides or live specimens to wall screen
nl to table-top for tracing. BALOPTICON* PROJECTORS give big, bright, lasting views
of slides, opaque objects, even chemical reactions. cA B&L SPECTROSCOPES. Basic chemical
analysis tools; show spectra of elements. STUDENT-PROOF construction of all instruments gives
years of service at a cost to fit any school budget. WRITE for Catalog E-152; demonstration on
r equest. No obligation, of cour se. Bauschl & Lomb Incor-porated,75M909 Bafusch Street, Rochester 2,2lNew York.
Tr c(( k1, JIusch &S LoWil) Ioco ll itf dO 1- L~ %- X,IV L.. I1 -