TOTAL COVERAGE!

No matter what your problem, let us help you solve it. ... meet your specific needs. ENGIS EQUIPMENT ... 53 on Readers' service Card. 11_IV. POSITION_...
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GRATING OR PRISM?

TOTAL COVERAGE!

VACUUM OR AIR?

Choose f r o m t h e world's largest selection of monochromators and spectrometers

About to specify a Monochromator

I

Spectrometer?

Engis offers the largest selection of Mono­ chromator and Spectrometer systems in the world, with an extensive line of accessories for these instruments, including . . . cameras, de­ tectors, wavelength modulators, interferometers, lamps (N.B.S. calibration), f i l t e r s , lenses, densitometers and measuring microscopes. A. Wavelength Spectrometer Β. Prism/Grating Spectrometer C. Vacuum Spectrograph

G. Grating Spectrometer H. Instruments modified to meet your specific needs

D. Prism Monochromator E. Grating Monochromator F. Double Monochromator

INSTRUMENTATION DIVISION 8 0 3 S AUSTIN A V E . , MORTON GROVE, ILL. 6 0 0 5 3

ENGIS EQUIPMENT COMPANY

Send complete information on the following:

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My requirements

No matter what your problem, let us help you solve it. Mail the coupon for additional information.

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Engis

INSTRUMENTATION DIVISION

ENGIS EQUIPMENT

COMPANY

CITY

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8035 Austin Ave., Morton Grove, Illinois 60053 • 312-966-5600 Circle No. 53 on Readers' service Card

VOL.

40, NO. 12, OCTOBER 1968

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129 A