PARR INSTRUMENT CO

Sorenson & Co., Inc. 375 Fairfield Ave. Stamford ... paper electrophoresis system - including the. Analytrol, a ... Telephone: Capital 4-5343. Write f...
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m o d e m analysis in p r o d u c t i o n and research are m a n u f a c t u r e d by G. Frederick Smith. Perchlorates, periodates, phenanthrolines, polypyridines, cerium c o m p o u n d s , indicators, a n d d e h y d r a t i n g reagents are m a i n p r o d u c t s . Sorenson & Co., Inc. 375 Fairfield Ave. Stamford, Conn. M a n u f a c t u r e r of a complete line of s t a t i c power supplies using electronic a n d m a g ­ netic controls, including precision electronic a.c. line regulators with 0.1 and 0 . 0 1 % regulation; M V K tubeless regulators; m a g ­ netic amplifier controlled a.c. and d.c. s u p ­ plies; N o b a t r o n regulated d.c. power s u p ­ plies for low voltage, high c u r r e n t ; BN o b a t r o n s for high voltage d . c ; precision frequency changers; a.c. voltage reference sources. Special power supplies for incor­ poration in c u s t o m e r s ' e q u i p m e n t can be developed and m a n u f a c t u r e d . Ivan Sorvall, Inc. Pearl St. Norwalk, Conn. M a n u f a c t u r e r and distributor of Servall l a b o r a t o r y i n s t r u m e n t s , including angle centrifuges, refrigerated centrifuges, homogenizers, ultramicrotornes. Also, a u t o m a t i c pipets, conductivity bridge, electrophoresis a n d c h r o m a t o g r a p h y e q u i p m e n t , gas a n d moisture testers. Spectra Bind Associates Brooklyn 13, Ν. Υ. Supplier of spectra binders for filing spec­ t r o g r a m c h a r t s obtained from all infrared, ultraviolet, mass, N - M - R , etc. Directrecording s p e c t r o p h o t o m e t e r s . Special bind­ ers for a u t o m a t i c recorder strip c h a r t s . Spex Industries, Inc. 80-56 230th St. Queens Village 27, Ν. Υ. Developer a n d m a n u f a c t u r e r of spectro­ g r a p h ^ s t a n d a r d s for s e m i q u a n t i t a t i v e anal­ ysis of almost a n y m a t e r i a l . Manufacturer of spectrographic accessories and distributor of plates, film, and electrodes for emission spectrochemical analysis. Spinco Division Beckman Instruments, Inc. 661 O'Neill Ave. Belmont, Calif. P r o d u c t s include l a b o r a t o r y i n s t r u m e n t s for molecular separation of materials for purposes of purification, identification, and characterization. Instruments include M o d e l Ε analytical ultracentrifuge, Model L p r e p a r a t i v e ultracentrifuge, M o d e l H electrophoresis-diffusion i n s t r u m e n t , Model R paper electrophoresis system - including t h e Analytrol, a recording-integrating densi­ t o m e t e r — a n d Model C P continuous paper electrophoresis i n s t r u m e n t . Standard Polarimeter Co. 225 East 54th St. New York 22, Ν. Υ.

Parr

Self-Sealing

Oxygen Bombs

A. N o . B. N o . C. N o . D. N o . E. No.

1101 d o u b l e v a l v e , 360 m l . 1 102 single v a l v e , 360 m l . 11 05 d o u b l e v a l v e , 340 m l . 1 104 d o u b l e v a l v e , 240 m l . 1 103 single v a l v e , 50 m l .

Ask your Parr Dealer for details or write direct for Specification No. 1100.

PARR EST. 1899

«

Leading laboratories de­ pend on Parr bombs for calorimetry, sulfur a n d other oxygen combustion tests. F i v e convenient, self-sealing bombs are of­ fered for burning samples rapidly and without loss of combustion products.

INSTRUMENT CO..

MOLINE. ILLINOIS

MAKERS OF CALORIMETERS AND PRESSURE REACTION EQUIPMENT

For further information, circle number 59 A-1 an Readers' Service Card, page 63 A

MODERN PRODUCTION AND RESEARCH DEMAND MODERN ANALYSES Perchloric Acid and Perchlorates Cerium (III), and (IV), Reagents Periodic Acid and Periodates Oxidation-Reduction Indicators Iodic Acid and lodates Organic Précipitants Primary Standard Reagents for Oxidimetry, Reductimetry, Acidimetry, lodometry and Alkalimetry. D e h y d r a t i n g R e a g e n t s — A n h y d r o u s Magnesium and Barium Perchlorates; " A n h y d r o c e l " — Chemically pure, g r a n u l a r , a n h y d r i t e , r e g e n e r a t i v e . M a d e from Selenite (C.P. C a S O r 2H20)

Spectrophotometric Trace Element Organic Reagents for Iron, Copper and Cobalt

Polarimeter equipment. Standard Scientific Supply C o r p . 3 4 West 4 t h St. N e w York 12, Ν . Υ.

D i s t r i b u t o r and m a n u f a c t u r e r of a com­ plete line of l a b o r a t o r y a p p a r a t u s chemicals, and reagents. Publisher of m a n u a l s of clinical m e t h o d s . "Serving Science Since 1888." The Superior Electric Co. 83 Laurel St. Bristol, Conn. M a n u f a c t u r e r of complete line of voltage control e q u i p m e n t P o w e r s t a t variable t r a n s ­ formers, Stabiline a u t o m a t i c voltage regula­ tors, Varicell d.c. power supplies, Voltbox a.c. power supplies, and 5-Way binding posts. Talboys Instrument Corp. 13 Ackerman Ave. Emerson, N. J. M a n u f a c t u r e r and designer of l a b o r a t o r y i n s t r u m e n t s including stirrers, c o n s t a n t t e m ­ p e r a t u r e e q u i p m e n t , etc. Also designs and m a n u f a c t u r e s special e q u i p m e n t to meet speci­ fications of A S T M , T A P P I , S P I , A O A C , etc.

1,1 0-Phenanthrolines 4 , 7 - D i p h e n y l - l ,1 0-Phenanthroline (Bathophenanthroline) 4 , 7 - D i h y d r o x y - l ,10-Phenanthroline (Snyder's Reagent) 2,2'-Bipyridines 2,2',2"-Tripyridines 2,2'-Biquinoline (Cuproine) (Breckenridge-Gillis Reagent) 2,9-Dimethyl-l ,1 0-Phenanthroline (Neo-Cuproine) 2,9-Dimethyl-4,7-Dpphenyl-l ,1 0-Phenanthroline (Batho-Cuproine) Pioneers in the Manufacture of Ferroine-Cuproine-Terroine Organic Chelation Reagents

G. Frederick Smith Chemical Company, Inc. 8 6 7 M c K i n l e y A v e . , C o l u m b u s 16, O h i o P.O. Box 1611 Telephone: Capital 4 - 5 3 4 3 Write for descriptive literature coverins analytical procedures in the utility of the above chemicals.

Veritas Tametsi Caeia Cadant For further information, circle number 59 A-2 on Readers' Service Card, page 63 A

VOLUME

2 8 , N O . 4, A P R I L

1956

59 A