36 A
ANALYTICAL
Works 15% to 21% faster on toughest cleaning jobs!
CHEMISTRY
@entoùl·.. < Sfceedty and NOW... All Coleman Junior Spectrophotometers Are INTERCHANGEABLE! The. new JUNIOR Spectrophotometers are now calibrated at the factory to insure EQUAL performance. And you may verify this calibration in a few seconds . . . correcting minor changes by the turn of a single thumb screw.
ALCONOX Cleans Better, too W h a t ' s your t o u g h e s t c l e a n i n g problem? Give i t t o Alconox, t h e soapless cleanser t h a t works o n a n e w principle. T e s t s s h o w Alconox re m o v e s grit, grease, g r i m e , dirt from h a r d - t o clean glass, m e t a l , porcelainware, e t c . , at least 15% t o 2 1 % faster t h a n soap cleansers. Leaves t h e m sparkling. No film; n o s t r e a k s . C o n t a i n s n o s o a p , yet gives rich s u d s even i n hard water. Amazingly e c o n o m i c a l as t o c o s t a n d storage. One spoonful m a k e s a gallon of active cleanser.
TURNINC ONE KNOB permits selection of any color light band required.
Cleans Brilliantly Glassware Machine parts Metalware
Cloth, Walls Porcelainware Pipettes
Used By Leading Hospitals Laboratories Hotels
3-lb. b o x . . $1.25
Food processors Bottling plants Chemical works
12-box c a r t o n . $13.50
50-lb. b a g . .$16.00
Send for Free Sample or Order from your dealer Burrell Technical Supply Co Chicago Apparatus Co W . H . Curtin & Co Eberbach & Son Co Greene Brothers Inc A . J . Griner Co Howe & French Inc Macalaster, Bicknell Co " Cambridge 3 9 , Mass E. Machlett & Son E. F. Mahady Co". Roemer Drug Co Ε. Η . Sargent & Co
Pittsburgh 1 9 , Pa. Chicago 2 2 , Ml. Houston 1 , Texas A n n Arbor, Mich. Dallas 2 , Texas Kansas C. 8, M o . Boston 1 0 , Mass. Syracuse, Ν . Υ . New Haven, Conn. New York 1 0 , N . V. Boston 1 6 , Mass. Milwaukee 2 , Wis. Detroit 7, M i c h . Chicago 1 1 , III. Standard Scientific Supply Corp New York' 1 2 , N . y . Williams, Brown & Earle Inc Phila. 7, Pa. Canadian Laboratory Supplies Ltd. Montreal, Toronto and Winnipeg, Canada A L C O N O X INC. New York 1 2 , N . y .
Thus, published curves may now be duplicated exactly . . . all your instruments may use the same direct reading scale. No FILTERS . . . just turn one dial for the precisely centered wave band you need! All colorimetric determinations . . . concentration of substance in solution versus transmittance . . . may be read directly with interchangeable scales, or you may plot curves on the usual semilog graph paper.
Expression of color of a solution, formerly done on Lovibund Tintometer, is now more accurately expressed
with
Spectrophotometer
readings!
Swift & Company use 8 Juniors for this ! * All colorimetric procedures are easily changed to fit the increased sensitivity of this modern instrument. As much of this work has already been done by present users, we now have detailed procedures for many determinations. Write for . . . METHODS OF VITAMIN ASSAY (Assoc. Vit. Chemists) SYMPOSIUM ON ANALYTICAL COLORIMETRY & PHOTOMETRY FERROUS & NON FERROUS METALS(A.S.T.M-) STEEL & IRON ANALYSIS
$3.50 1.00 FREE
SINGLE SAMPLE METHOD FOR P, Mo, Ni and Cr IN IRON AND STEEL (Sober) FREE BULLETIN No. IE-2, DETAILED DESCRIPTION OF T H E JUNIOR 'SPECTROPHOTOMETER FREE BOILER WATER ANALYSIS FREE CLINICAL METHODS FOR T H E COLEMAN CLINICAL SPECTROPHOTOMETER MODEL-6
$7.50 IE 2.48
ALCONOX
cleans better cleans quicker
WILKENS-ANDERSON CO. 111 NORTH CANAL STREET · CHICAG06. ILLINOIS
