LABORATORY SUPPLY CENTER PREFERRED — pH CONTROL CHLORINE CONTROL PHOSPHATE CONTROL maintained with accuracy, simplicity and low cost by the
LaMOTTE COMPARATOR METHOD
Standardized ALUMINA "Woelm" For
A c i d , Non-alkaline, Basic Highest activity, GRADE 1
W e invite your inquiries
ALUPHARM CHEMICALS 5 4 C St., Elmont, L. Ι., Ν. Υ.
CLARK MICROANALYTICAL LABORATORY
LaMOTTE PRODUCTS
CHEMICAL COMPANY
Dept. A.C., Towson, Baltimore 4, M d .
Routine Analyses in one week CH, N , S, Halogen, Fluorine, Oxygen, Alkoxyl, Alkimide, Acetyl, Terminal Methyl, etc., by specialists in organic microchemical analysis. Howard S. Clark, Director P. O . Box 17 Urbana, III.
for Sugar and Soluable Solids Determinations. Invaluable to Growers, Inspectors, Food Packing Plants. Conversion table for Refractive Indices is provided for use in other measurements.
Analytical Filter Aid Leading Iaborato- _ ries have found that Celite Analytical Filter (j Aid is invaluable for filtering out gummy, gelatinous, flocculent o r semicolloidal precipitates—many of which are unfiiterable by other methods. C h e m i callyinert,it is made from t h e h i g h e s t q u a i i t y diatomite w h i c h has been calcined at h i g h temperatures a n d acid-washed to remove all o r g a n i c a n d i n o r g a n i c impurities. For complete precipitate retention a n d brilliantly clear filtrates at h i g h flow rates, use Celite Analytical Filter Aid. Full infor mation o n request. Johns-Manville, Box 6 0 , N e w Y o r k 16, Ν . Υ. *Reg;. U.S.Pat. Off.
WISCONSIN «LUMNI RESEARCH FOUNDATION
•
QUANTITATIVE MINERAL! ANALYSES INCLUDING 1 SODIUM AND FLUORINE Proximate analyses ·
and amino acid assays ·
HAND REFRACTOMETERS
CELITE
Chromatography
Packings: 1 0 0 g, 5 0 0 g, 1 0 0 0 g, 5 0 0 0 g
These time-tested instruments have served Science & Industry for more than 31 years. Consult LaMotte for a complete line of simplified Equipment & Reagents for: pH Control, Chlorine Control, Boiler Feed Water Control, analysis of Water, Sewage, Industrial Wastes, Control of Electroplating Baths and Cleaning Solutions, Soil Testing, Vitamin Studies.
for laboratory filtrations
TEMPERATURE
CONTROLLER
Vitamin
Screening
of compounds for insecticidal, fungi cidal, and bactericidal properties PROJECT RESEARCH AND CONSULTATION
»%J» WISCONSIN ALUMNI • & * . i . RESEARCH FOUNDATION P.O. BOX 2059-C · MADISON 1, WIS.
Accuracy: ± 0 . 0 0 1 °C Range: - 1 0 0 ° C t o 500°C Resistance Thermometer, Precision Bridge Circuit
TECHNICAL EQUIPMENT COMPANY 743 Dwight Way
LOOK TO WEBER
Eliminates Grease In Float U- Tubes Prevents Sticking
A few drops of sample is sufficient Guaranteed—Accurate— Two Ranges—Specify which one. 0 - 3 2 % b y 0 . 2 % Divs. 3 0 - 6 6 % by 0 . 5 % Divs.
/ \
**Q 00 *OV.—
Send Check—Parcel Post Prepaid
LABORATORY EQUIPMENT CO. 6 4 9 Bryant St., San Francisco 7, Calif.
COUNT RADIOACTIVE SAMPLES AUTOMATICALLY! Free your technician for o t h e r work—count up to 50 radioactive samples a u t o m a t i c a l l y with M o d e l C-110 S a m p l e Changer. Auxiliary Printing Timer records time required to accumulate preset n u m b e r of counts. Write for details today—C14 Chemical List also available.
nuclear •céictrgQ • 251 W. Erie Street, Chicago 10, 111.
FOR MODULAR LABORATORY EQUIPMENT Architects or school purchasing departments are invited to con sult with Weber regarding the most modern functional labora tory equipment. Information and photographs of various installations on request.
UfEBER SHOWCASE & FIXTURE CO., INC. 5700 AVALON BLVD., LOS ANGELES 11, CALIFORNIA
66 A
Berkeley 10, Calif.
NEW DELMAR-URRY GREASELESS VALVE
A new stock-type greaselesa mercury float valve that elim inates grease from the float U-tubes and apparatus on which it is used. A mercury sealed needle valve, built into the mercury reservoir, screws down on a ground glass seat insuring positive action and rapid, easy operation. The entire valve is grease-free for pro tection of apparatus and re mains operative for a much longer period than old type lubricated valves. Available in 10MM and 15MM sizes. Write dept. GS today for complete informa tion and prices. FREE 52 PAGE CATALOG of Standard and Special Glass Apparatus sent on request.
Delmar Scientific Laboratories 1551 NORTH CICERO AVENUE
ANALYTICAL
·
CHICAGO 51, ILLINOIS
CHEMISTRY
