CHICAGO
changed the direction of its river's flow
grant Instruments presents COMPUTER COMPATIBLE MEASURING ENGINES
to stem the pollution of Lake Michigan, its water supply. N o w t h e u r b a n s c e n e is threatened with many kinds of pollution . . . and urban and rural areas alike are involved in new methods of • clean-up • conservation • re-use of resources. Chemists and Chemical Engi neers are important contributors to environmental research and technical developments. Read about practical applica tion;; . . . theoretical studies . . . important, surveys of scientific industrial - - governmental a c t i v i t y in e n v i r o n m e n t a l control from the chemical point of vicvj . . . Subscribe to the monthly ENVIRONMENTAL SCIENCE & TECHNOLOGY 1 Year: ACS Members ...$5.00 All others ...$7.00 POSTAL none $1.00 $1.50
CHARGES: Domestic PUAS & Canada Foreign
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Environmental Science and Technology
position,
HIGHEST ACCURACY Precision lead-screw driven Less than 1 micron backlash Better than 1 micron measuring accuracy X-Y indexing to 1/4 micron EIGHT AVAILABLE TWO-COORDINATE FORMATS: 50 50 50 100
mm mm mm mm
X X X X
250 350 450 250
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Please indicate whether you are an ACS member and if you are, please use address in which your membership is recorded. You may enclose your check or ask to be billed .iter Bu sure lo ndd postal costs where applicable.
mm mm mm mm
X X X X
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X-Y indexing to 1/4 micron is possible for manual or automatic positioning by high and low-speed scan ning motors. VERSATILE This equipment can be made available with complete instrumentation for installations such as the following: Spectra-wavelength measuring comparators Star-plate measuring comparators Fast-scan densitometers High-resolution microphotometers Film readers with position and density readout Continuously self-calibrating iris photometers
Oscilloscope pattern permits accurate line settings within 1/4 micron
Dept. B
AMERICAN CHEMICAL SOCIETY 1155 Sixteenth Street, N.W. Washington, D.C. 20036
100 100 130 250
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GRANT INSTRUMENTS 1805 Eastshore Hwy., Berkeley, California 94710 (415) 548-0101 Circle No. 114 on Readers' Service Card
VOL. 41, NO
3. MARCH
1969
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127 A
