MANUFACTURERS' LITERATURE
For Your LABORATORY
Electrical Equipment. À 48-page catalog of electrical laboratory equipment— including distribution switchboards, control boards, test panels, service units, power supplies, timers, and tachometers —produced by The Standard Electric Time Co. (Booklet 187). 29
α complete line of GLASSWORKING
Polyethyleneware. Various types of laboratory items made of polyethylene are listed and illustrated in brochure of 8 pages. Scientific Glass Apparatus Co., Inc. (Bull. P-1154). 30
EQUIPMENT Bethlehem Lab-Lathe Bethlehem Seal-Crib Lathe Burners Blast Burners Hand Torches Glassworking Tools Wet-Cut (Glass Cut-off Machine)
Write today for Catalog C-54
BETHLEHEM Apparatus Company, Inc. HELLERTOWN,
PENNSYLVANIA
For further information, circle number 60 A-1 on Readers' Service Card, page 49 A
/ :
FILL
Make Them In a
Soil pH Determinations. Description of method for reducing the standing time in soil solutions of pH meter electrodes used in making multiple soil pH deter minations, as developed at Ontario Agricultural College. Beckman Instru ments, Inc. (Data Sheet 25-13). 33
Vitamin D Assay. Folder describes assay service and lists prices of vitamin D determinations performed by Foster D. Snell, Inc. 35 Hoods. Six-page folder describes trans parent plastic, portable environmental housings designed to maintain controlled atmospheres of sterile air and varying relative humidities. P. M. Lennard & Co., Inc. 36
COMPRESS
PARR PELLET PRESS
Microscope Illuminator. Folder of 6 pages describes illuminator that can be attached to any standard microscope to provide an integrated unit for visual microscopy or photomicrography. Silge and Kuhne (Bull. 28-2). 37
FIVE EASY STEPS convert powdered samples into convenient tablet or pellet form using the Parr Series 2811 Pellet Press. Only stainless parts contact the s a m p l e . M o d e r a t e hand pressure d e v e l o p s compressive force o f approx. 2000 psi. Pellets are easily ejected into a stainless receiver. Interchange able punch and die sets offered in three sizes.
PARR INSTRUMENT
pH Control. Four-page data sheet discusses measurement and control of pH of cooling tower water, and de scribes equipment for this purpose. Leeds & Northrup Co. (Proc. Data Sheet 70011}). 32
Organic Microanalyses. Leaflet of 4 pages lists prices of routine and nonroutine quantitative organic micro analyses and gives information on serv ices of Clark Microanalytical Labora tory. 34
Need Special Pellets?
Obtainable from any Parr Dealer, or write direct for details.
Filter Papers. Six-page bulletin describes and gives specifications for various grades of Munktells Swedish filter papers, including papers for chromatographic and electrophoretic use. Ε. Η. Sargent & Co. 31
EJECT
_
REMOVE
CO.. MOLINE. ILLINOIS
MAKERS OF CALORIMETERS AND PRESSURE REACTION EQUIPMENT
Laboratory Chemicals. A price list of 128 pages gives specifications of laboratory chemicals available from Merck & Co., Inc. 38 _
Platinum Electrodes. Bulletin of 8 pages illustrates various types of plati num sheet or gauze electrodes made by J. Bishop & Co. Platinum Works. 3 9 For further information, see coupon on page 49 A
For further information, circle number SO A-2 on Readers' Service Card, page 49 A
60 A
ANALYTICAL
CHEMISTRY
