ANALYTICAL
40A
THE
LABORATORY
CHEMISTRY
SUPPLY CENTER
WILSON REPEAT CYCLE TIMER Ratios fo 2000.-T Bof/i iniervali Adjustable Repeats Continuously
Certified Buffer Solution for your pH M e t e r . . . at $1.88 per liter! Each Coleman Certified Buffer Tablet makes 100 ml of FRESH liquid buffer solution . . . for calibration of ANY pH meter! Tablets keep indefinitely. Order an assortment... any pH value from 2.00 pH to 11.80 pH, in steps of 0.20 pH— specify Cat. No. AC-5. Per Vial of 12 tablets $2.50 Per Box 6 Vials (same pH) $13.50 LABORATORY
SUPPLIES AND CHEMICALS
FOR ACCURATE
"WRIST-ACTION"
Reflux Control Constant, known reflux ratios as high as 2000;! are easy to establish and control with this new electronic timer which is guaranteed accurate with in 2 % . Adjustable for both intervals, it is.com pletely automatic, oper ates for months without attention. No moving parts except contactor. Take the guesswork out of refluxing. Order one Wilson Timer on 30-day trial basis. Satisfaction guaranteed. Or write for information
SPECIFICATIONS 105-120 volts, 60 cycles (DC timers also available) ON: 0.2 to 200 OFF: 0.1 to Λ0
SHAKER Burrell's " W r i s t - A c t i o n " S h a k e r is a fast, simple shaker f o r g e n e r a l l a b o r a t o r y use. It simulates t h e s n a p o f the wrist, c r e a t i n g a swirling splash. The n e w " F i n g e r - G r i p " c l a m p holds
Spec) plug ί strip.
most flasks, funnels a n d b o t t l e s . 115 V W r i t e f o r Bulletin 2 0 7 .
$60 1942
WILKENS ANDERSON CO.
150 Broadway New York 7
BURRELL
STARK SALES CO.
ORIGINAL-ODHNER HANDY CALCULATORS
Sturdy: Low Priced: Weight 12 lbs. Easy to Learn: New Back Transfer Device Speeds Up Calculations
Ask For B u l l e t i n NQ-53 SOLE DISTRIBUTORS
FOR U . S . A .
I V A N SORVALL, INC.
A Practical, Easy to Operate, High In tensity Sonic Generator for Research in Chemical Reactions, Emulsions, Pharma ceuticals, etc. Inquiries on Ultrasonic Problems Invited. CRYSTAL RESEARCH LABORATORIES, Inc. 29 A l l y n St. · Hartford, Conn.
Stainless
Steel
•0
' Τ
Wf%
Hand | y* Homogenizer
2 1 0 FIFTH AVE., NEW YORK 1 0 , Ν. Υ.
Save time in product research — test new products and processes.
LABORATORY SERVICES
H a n d l e s acids, alkalis! Holds 2-10 oz. test batches!
V i t a m i n Assays b y biological, mi crobiological, and physico-chemi cal means Mineral Determinations Food Bacteriology Fungicidal and Bactericidal Evalua tions Insecticide Testing
C o m p a c t , simple to operate, clean; can be sterilized.
WISCONSIN ALUMNI RESEARCH FOUNDATION P. O . Box 2 0 5 9 M a d i s o n 1 , Wisconsin
PENNSYLVANIA
Crystalab's ULTRA-SONORATOR
NEW! F o r T h e C h e m i s t AndJJEngineer
FIFTH AVE
P I T T S B U R G H 19
Precision engineered; ground and honed pistons and cylinders; a l l parts c o n t a c t i n g m a t e r i a l s a r e stainless steel. Adjustable pressures. only $ 1 9 . 9 5 order from your supply dealer or write to
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