EASTERN

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SCIENTIFIC INDUSTRIES

ULTRA-BURET

A NEW INSTRUMENT THAT GIVES YOU . . . • PRECISE CONTROL OVER ULTRAMICRO QUANTITIES — Markings to .001 ml.; can be read to .0001 ml. • HIGH CAPACITY—up to 7 ml. without refilling. Ultra-micro and macro. • EASY READING ON CALIBRATED WHEEL — No meniscus; simple reset to zero to start each titration. • INSTANT SPEED ADJUSTMENT— Perfect control without use of valves or stopcocks. Just turn the wheel. Take Advantage of our 30 Day Test in your Laboratory Ask your Laboratory Supply Dealer for particulars . . . or write for Descriptive Bulletin!

SCIENTIFIC INDUSTRIES, INC. 13 Park Street

Springfield 3, Mast.

Circle No. 30 A on Readers' Service Card

ORGANIC REAGENTS Dithiol (Toluene-3,4-Dithiol) Diacetyl-, Dibenzoyl- and Zinc-Dithiol Benzyl Trimethyl Ammonium Hydroxide (40% Aqu. Sol.) /3-Naphthoquinoline - Imidazole Triphenyl Phosphine Glycerol-l,3-Dichlorohydrin Dimethylglyoxime & Sodium Salt 2,4-Dinitrophenylhydrazine Malonic Acid, Reagent Phenazine & Phenazine Methosulfate Digitonin * lodoacetic Acid Murexide · Ninhydrin Orcinol Phloroglucinol

EASTERN CHEMICAL 34-K SPRING STREET

CORPORATION NEWARK 4, N. J.

Circle No. 88 λ on Readers' Service Card 38 A

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ANALYTICAL CHEMISTRY

ADVERTISERS' PRODUCT GUIDE Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Nuclear Corp. of America* Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Photovolt Corp.* 0. C. Rudolph & Sons, Inc.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Will Corp. 136. MORTARS AND PESTLES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Coors Porcelain Co.* Harry W. Dietert Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co.

Microchemical Specialties

New York Laboratory Supply Co. Norton Co.* Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Spex Industries, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. 137. NEPHELOMETERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. C. A. Brinkman & Co. Burrell Corp. Chemical Rubber Co.* Coleman Instruments Co., Inc.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Arthur S. LaPine & Co. Phoenix Precision Instrument Co. Photovolt Corp.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp. NEUTRON SOURCES—see radiation equip­ ment 138. NITROGEN DETERMINATION APPA­ RATUS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Corning Glass Works* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Construction Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. NRC Equipment Corp.* Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Texas Nuclear Corp.* Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp. 139. NITROMETER Chemical Rubber Co.* Fisher scientific Co.

General Laboratory Supply Co.

Emil Greiner Co.

Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Schlumberger Well Surveying Corp.* Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Arthur H. Thomas Co. OHMETERS—see ammeters 140. OSCILLOSCOPES Allied Radio Corp.* American Instrument Co.* Baird-Atomic, Inc.* Cambridge Instrument Co.* Central Scientific Co.* Fisher Scientific Co. Radio Corp. of America* Southern Instruments, Ltd.* W. M. Welch Manufacturing Co. Welwyn International, Inc. 141. OVENS—see also combustion equip­ ment Ace Glass, Inc. Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Blue M Electric Co.* C. A. Brinkmann & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co.* Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Despatch Oven Co.* Harry W. Dietert Co.* Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Grieve-Hendry Co., Inc.* Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine & Co. National Appliance Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp. OXYGEN ANALYZERS—see equipment

combustion

OXYGEN BOMBS—see calorimeters 142. PAINT TESTING APPARATUS American Hospital Supply Corp. American Instrument Co.* C. W. Brabender Instruments, Inc.* Burrell Corp.* Chemical Rubber Co.* Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Sadtler Research Laboratories E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co.

Tenso-Lab, Inc.

143. PARTICLE SIZE APPARATUS American Hospital Supply Corp. American Instrument Co.* C. A. Brinkmann & Co.* Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Harshaw Scientific Divsion of Harshaw Chemical Co. Arthur S. LaPine & Co. Millipore Filter Corp.* Palo Laboratory Supplies, Inc.* Phoenix Precision Instrument Co.* Prolabo* Schaar & Co. Scientific Glass Apparatus Co. Sepor Laboratory Supply* Sharpies Corp.*