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
