NEW
INTERFEROMETRIC
this
year
Κ
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CONTROL... KEY TO QUALITY LEADERSHIP for Bausch & Lomb
at the Pittsburgh Symposium
Certified Precision Diffraction Gratings
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Cahn FULLY AUTOMATIC Electrobalance® for tablets, capsules and similar pressed analytical samples. Just toss 'em in and tear off the automatic data record. Bring your QC manager to see this one. L·. Quantitative Chromatography apparatus for the accurate determination of all fractions in column, paper, and thin-film chromatography. Detects fractions that other methods miss. «5· Time Derivativi; Computer for the recording vacuum Electrobalances.® Computes the time rate of change of sample
EVERY S T E P O F T H E W A Y . . . t h e t e s t i n g of m a s t e r g r a t i n g blanks, coatings, groove shapes, diamond a n d grating carriage mo tion, a n d quality of masters a n d replicas . . . is under the most rigid INTERFEROMETRIC C o n t r o l . YOU
weight ( - J I - vs t dt for recording on a separate recorder. In thermogravimetry it brings out details that would otherwise be missed, yields kinetic data directly, eliminates graphical differentation. •
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SEE THEM ALL IN BOOTH 1-52* Mark your program now! *4th floor
CAHN
are assured of the highest preci sion standards a n d finest quality gratings you can buy. Since 1950, reliance on INTERFEROMETRIC con
trol h a s been t h e key to the high resolving power, low ghosts a n d high efficiency which have made Bausch & Lomb Diffraction Grat ings world famous . . . a n d pre ferred by all major manufacturers of spectroscopic instruments. There are 672 different sizes and types of plane reflectance, transmission and concave gratings that cover a range of wavelengths from 10A (x-rays) to 10 7 A (far infrared). W e can also produce
special types for your unusual re quirements. Any size u p to 200 χ 350mm (8" χ 14") is currently available. (Again, larger sizes can be obtained on special order.) Our subterranean laboratory, built within layers of solid rock, offers stability, cleanliness a n d a unique capacity to supply grat ings in even large quantities . . . within reasonable delivery re quirements. Thirteen years of pioneering experience in developing and sup plying gratings to astronomers, spectroscopists, instrument manu facturers, a n d other scientists has given Bausch & Lomb engineers the extensive knowledge and unequaled know-how that can assist you with your grating problems. Write to Bausch & Lomb Incorpo rated, 90202 Bausch Street, Roch ester 2, Ν . Υ., for the new Catalog D-261 for prices, uses, character istics a n d details on t h e theory and mechanics of diffraction grat ings . . . it's the most comprehen sive gratings catalog available anywhere.
BAUSCH & LOMB
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In Canada, w r i t e Bausch & Lomb Optical Co., Ltd., Dept. 902,
Scientific
Instrument
Division,
16 Grosvenor
Street, Toronto 5, Canada.
INSTRUMENT COMPANY 15505 Minnesota Ave., Paramount, Calif.. U.S.A. Circle No. 192 on Readers' Service Card
Circle No. 26 on Readers' Service Card
VOL. 36, NO. 2, FEBRUARY 1964 ·
171 A
