NEW PRODUCTS
mechanism in the plunger permits the discharge to be controlled from a rapid to a barely perceptible flow. 10 Microscope V i e w e r
The Micro-Viewscope, distributed by William J. Hacker & Co., Inc., combines in one unit a 75 X and 500 X microscope with enclosed illumination and projec tion elements that render an image on an 8-inch ground glass screen. The instrument has a mechanical stage that offers control for centering or for
scanning details of a slide and is equipped for photomicrography. Micro-Viewscope is claimed to give relief from eyestrain and facilitates dis cussion by a number of observers who are studying material together on the ground glass. 11 O r g a n i c Chemicals
Eleven organic chemicals have been added to the list of materials offered by Distillation Products Industries. Among these is squalene, distilled by
D P I from the liver oil of the basking shark as a colorless liquid with a boiling point of 330° C. at atmospheric pres sure and believed to be 90 to 9 5 % pure. Other new organic chemicals are : l,2-Bis(2-methoxyethoxy)ethane w-Butylamhie hydrochloride 5-Chloro-3-nitro-o-phenylenediamine (p-Chlorophenyl) acetonitrile iV,iV'-Dimethylcarbanilide 2-Hydroxymethyl-2-methyl-1,3- pro panediol Phenyl selenide 4-Picoline η-Propyl nitrate ι Tri-w-propylamine Ϊ2 Oxygen Analyzer
A direct-reading dissolved oxygen analyzer claimed to operate as simply as a conventional pH meter has been developed by Dorber Co. The amperometric type instrument employs a ro tating platinum electrode with a stable electronic system which automatically translates diffusion current into units of dissolved oxygen concentration. It determines dissolved oxygen from 0 to 10 p.p.m. within 5% accuracy for most aqueous solutions. Operation is on 115-volt a.c. current, and is not affected by power line fluctuations.
OF RESEARC Where rigid laboratory specifications for control must be met, Tygon R-3603 flexible plastic laboratory tubing is specified by research laboratories the world over.
Specify the genuine . . . the quality tubing that is branded — Tygon R-3603. Available at your laboratory supply house.
Tygon R-3603 is chemically inert, com pletely non-toxic and non-oxidizing. Glass clear, Tygon R-3603 offers complete solu tion visibility. Its mirror-smooth walls offer minimum restriction to flow. Tygon R-3603 while extremely tough and durable is flex ible as a string. It is easily connected and is adaptable for branching lines 'with Tygon "Y" fittings. Tygon R-3603 is normally available in sizes ranging from .120" I.D. — 2" I.D.
PRODUCT OF
195-D
46 A
U. S. STONEWARE Akron 9, Ohio
PLASTICS A N D SYNTHETICS D I V . For further information, circle number 46 A on Readers' Service Card, page 41 A
The instrument is not subject to in terference by dissolved iron, calcium, magnesium, sulfides, nitrites, or organic matter, according to the manufac turer. Samples can be colored or tur bid. 13 Photometric Scanner
A scanner for measuring the amount and distribution of materials on paper strips from electrophoresis and paper chromatography work is being sold by Research Specialties Co. The Model 2001 device is for use in Beckman Model DU spectrophotometers. The scanner is designed so that the paper strip can be moved past the slit window of the spectrophotometer for readings at intervals corresponding to the desired slit widths. By plotting optical density against distance for successive readings, a graph is obtained For further information, see coupon on page 41 A ANALYTICAL
CHEMISTRY
