PRODUCT CAPSULES Short "refreshers" on last month's ads. Obtain free information on any of the products or services described by writing in the appropriate key numbers in the "Product Capsules" portion of the reply card preceding this section.
Absorption cells. Catalog on cuvettes, storage racks, mixers. Ρ 148
Books. Physical principles and tech niques of protein chemistry. Ρ3
Absorbents. Technical purification of solvents alumina.
Books. analysis.
paper on by active Ρ 193
Analyzers. 19 different plug-ins for high and input medium resolution, sig nal averaging. Brochure. Ρ 61 Analyzers. Electrophoretic mass transport unit measures suspensions of particles up to 1,000 microns. Ρ 127 Analyzers. Pushbutton operation de termines x-ray energies, stores pro gram for continuous, repetitive analy sis. Ρ 155 Analyzers. Instant qualitative analy sis of metallic and non-metallic ele ments. Ρ 178 Atomic absorption. Bulletins on units for routine, multi-element, simul taneous analyses. Ρ 63 Balances. Catalog on 18 top-loading units with high load-to-precision ratio. Ρ 122
Balances. Catalog on 11 digital read out, high-speed, top-loading units. Ρ 123
Balances. Arrestment and beam re lease mechanism are fully automatic in line of 3 new units. Ρ 168 Balances. New top-loading unit has 160 g capacity, 1 mg accuracy. Ρ 175 Bombs. Specs on oxygen bomb com bustion apparatus to determine sulfur values. Ρ 144 Books. nance,
Advances in magnetic reso ρ 3
Books. vents,
Chemistry of nonaqueous sol ρ 3
Books. Equilibrium: solutions.
a chemistry of ρ 83
Books. Fundamentals of analytical chemistry. ρ 83 Books. Introduction chromatography.
to
gas-liquid Ρ3
Books. Introduction spectroscopy.
to
molecular ρ 3
Books. Paper chromatography electrophoresis.
and ρ 3
Principles
of
instrumeintal Ρ 83
Books. Research techniques in non destructive testing. Ρ3 Books. Spectroscopy chemistry.
in
inorganic Ρ3
Books. Standard methods of clinical chemistry. Ρ3 Cameras. Brochure on rotating prism unit which stops action at 5,000 pictures per second. Ρ 158 Centrifuges. Accommodates over 50 combinations of tubes with a range to 5500 rpm. Ρ 40 Chemicals. Data on reagent acids and electronic-grade chemicals. Ρ 37
Chloride equipment. Unit determines serum chloride in 40 seconds, has direct readout. Ρ 24 Choppers. Designed for photo- and radiometric applications with lock-in amplifier. Specs. Ρ 94 Chromatography. Bulletin on TLC analysis of toxic drugs. Ρ 56 Chromatography. Bulletin on chromatogram sheet and development ap paratus for TLC. Ρ 56 Chromatography. Bibliography on use of chromatography sheet in TLC. Ρ 56
Chromatography. Bulletin on sol vents and reagents for TLC. Ρ 56 Chromatography, gas. Pretested mo lecular sieves available in all mesh sizes. Ρ7 (Continued on page 136 A)
now... for applications where cool, noiseless operation... uniform flow rates, reproducibility, and simple reversibility are important...
ADVANCED
MODEL
varistaltic
pump
WITH SOLID STATE CONTROLS This versatile, foolproof model produces peristaltic effect to pump acids, bases, toxic and sterile liquids and gases — safely and quietly through flexible tubing — without the liquid coming in contact with pumping mechanism. Single control knob regulates uniformly variable speed control of gearless direct-drive perma nent-magnet motor by solid-state circuitry . . . for reproducibly adjusted speeds from 24 to 400 R.P.M. with ± 3% stability... and a delivery volume range from 30 ml. to 5,000 ml. per minute. Switch action re versibility; fingertip control of forward
and reverse speed. Maximum head—25 PSI gauge or 57 feet of water. Any soft, flexible tubing (from 45 to 70 durometer Shore) with Vu' wall up to % " inside diameter can be used. Unit weighs approx. 18 lbs.; is housed in handsome 2-tone lightweight metal cabinet—12 1 /2" long χ 9Vz" deep χ IVz" high. Available in 115-volt or 220-volt A.C. models. 72-895-05 Advanced Model Varistaltic Pump (115-volt A.C.) $275.00 72-895-05-22 Same Model, but 220-volt A.C $325.00
For information on our lull line of VARISTALTIC Pumps and VERSATUBE inert tubing) write lor Bulletin P-1. Available from your laboratory supply dealer
Manostat
Division of Greiner Scientific Corporation Dept. 521A, 20 North Moore Street, New York, New York 10013 (212) 966-1190 Circle Να. 64 on Readers' Service Card
(Chemically
SEE US AT THE FASΕΒ S H O W BOOTH T-10.
ANALYTICAL CHEMISTRY, VOL. 43, NO. 4, APRIL 1971
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135 A
