V O L U M E 2 4, NO. 4, A P R I L 1 9 5 2 47 A

INDEX TO ADVERTISERS Ainsworth & Sons, Inc., Wm 47 A Alconox, Inc 11A American Instrument Co. Inc 42 A Analyst, The 38 A

Baker Chemical Co., J. Τ 5 A Bausch & Lomb Optical Co 4th Cover Beckman Instruments, Inc 9 A Bersworth Chemical Co 41 A Brookfield Engineering Laboratories 39 A Burrell Corp 33 A

Central Scientific Co 12 A Chicago Apparatus Co 37 A Coleman Instruments, Inc 18 A Coors Porcelain Co 43 A Eastman Kodak Co ' 27 A Eberbach Corp 43 A Electric Hotpack Co. Inc 3G A

Farrand Optical Co. Inc 15 A, 45 A Fisher Scientific Co • 2nd Cover Fish-Schurman Corp 36 A

General Laboratory Supply Co 22 A Greiner Co., Emil 8 A Hacker & Co. Inc., Wm. J 20 A Harshaw Scientific Co 14 A

International Equipment Co 48 A

Jarrell-Ash Co 35 A

Kewaunee Mfg. Co 37 A Kimble Glass Div., Owens-Illinois Glass Co 3rd Cover Klett Mfg. Co 34 A, 38 A Laboratory Construction Co 41 A Laboratory Equipment Corp 39 A Laboratory Furniture Co. Inc 45 A Laboratory Industries, Inc 7 A Lindberg Engineering Co 45 A Machlett & Son, Ε 13 A Mallinckrodt Chemical Works 6 A Martin & Co., H. S 25 A Meyer Scientific Supply Co. Inc 37 A, 39 A National Appliance Co 37 A National Carbon Div., Union Carbide & Carbon Corp 23 A New York Laboratory Supply Co. Inc 36 A

Owens-Illinois Glass Co 3rd Cover Parr Instrument Co 26 A Perkin-Elmer Corp 24 A Photovolt Corp 34 A, 40 A, 42 A

Radio Corp. of America 21 A

Sargent & Co., Ε. Η 17 A Schleicher & Schuell Co 40 A Servo Corp. of America 43 A Superior Electric Co 34 A

Taylor & Co., W. A 20 A Thermal Syndicate, Ltd 26 A Thomas Co., Arthur II 16 A Todd Scientific Co 10 A

Union Carbide & Carbon Corp 23 A

Welch Scientific Co., W. M 28 A Wilkens Anderson Co 4 A

DIRECTORY Laboratory Supply Center 46 A

Cargille Scientific, Inc. Hagan Corp. Phillips-Drucker Co. Sorvall, Inc., Ivan Southwestern Analytical Chemicals Wisconsin Alumni Research Foundation

REINHOLD PUBLISHING CORPORATION Advertising Management for the

American Chemical Society Publications 330 W. 42nd Street, New York 36, Ν. Υ.

ADVERTISING SALES REPRESENTATIVES Merald Lue, Advertising Sales Manager

New York 36—BRyant 9-4430; Eastern Advertising Sales Manager, B. Franklyn LaRue; District Managers—James J. Sullivan, Thomas F. Casey, Brayton C. Nichols

Cleveland 13-630 Terminal Tower, PRospect 1-5583; District Manager—Rodney D. Long

Chicago 2-113 West Washington Street, RAndolph 6-8497; Western Advertising Sales Manager, G. E. Cochran; District Manager— Edward J. Fregan

San Francisco 5—McDonald-Thompson, 625 Market Street, YUkon 6-0647; Roy M. McDonald

Los Angeles 5—McDonald-Thompson, 3727 West Sixth Street, Dunkirk 7-5391; Ε. Τ. Thompson

Seattle 1-McDonald-Thompson, Terminal Sales Bldg., Main 3860; Harry Abney

Dallas 11-McDonald-Thompson, 1118 Odeans Drive, Winfield 4911; Richard C. Wipperman

in balances... IT'S THE LITTLE THINGS

THAT COUNT

ek?

For example—

this beam support could be made in many different ways; but if the top becomes loose or bent, the beam will not be picked up cleanly and the agate knife edges will be dulled sooner.

In Ainsworth Balances this part is made of one piece of solid brass. It is sturdy and the top cannot come loose. This is just one of the many little things that give you extra value when you . . .

SPECIFY A INSWORTH

Balances and Weights

WM. A I N S W O R T H & S O N S . INC. 2151 LAWRENCE STREET· DENVER 2, COLORADO