RADICALLY

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Keep things rolling in your laboratory COLORMASTER DIFFERENTIAL COLORIMETER ·

COLOR MEASUREMENTS made in less than 30 seconds! The Colormaster Differential Colorimeter* is the latest development in color measuring equipment. A complete set of color measurements can be made in less than 30 seconds by non-technical personnel. Equipment is direct reading on a low backlash dial, and is mechanically rugged, and stable. Dial linearity is within approx. 0.2% from 100% to 10% reflection or transmission and can be extended below 10% with approx. 0.02% linearity. • Three color filters enable % transmission or reflection to be read directly on front Panel Dial to within an estimated 0.01 %. • Simple calculation converts dial readings to I.C.I. X, Y, & Ζ functions. • Operates from 115 Volt 60 cycle line.

Save steps, time, breakage and labor costs with LABCONO specialized laboratory carts. Proctor and Gamble, Dow Chemical, University o f California, Armour and Company, and many other laboratories are using them to cut costs and lighten laboratory work. Pan-type carts, wire basket glassware carts, portable tables, 2-3-4-decker carts, Kjeldahl carts—18 different models in a l l . See your laboratory supply dealer or write the manufacturer t o d a y for free folio JJ-54.

LABORATORY

CONSTRUCTIOM

* Similar to instrument described at the March, 1952 meet­ ing of the Optical Society of America by L. G. Glaaser and D. 3. Troy of E. I. du Pont de Nemours & Co. Writ* for Complet* Information

MANUFACTURERS ENGINEERING & EQUIPMENT CORP.

COMPANY

I I MILL R0A0, HATB0RO, PA.

1 1 1 5 H o l m e s Street Kansas C i t y , M i s s o u r i Circle No. 72 A-1 on Reader*' Service Card, page 57 A

O P T I C A L

Circle

I N S T R U M E N T S

No. 72 A-2 on Readers' Service

Card, page 97 A

SINCE 1857, GOTTINGEN, ALLIED ZONE

R A D I C A L L Y N E W STYLE POLARIZING

MICROSCOPE

with

INCLINED

OBSERVATION

TUBE.

• Inclined observation tube with adjustable Amici-Bertrand lens, iris diaphragm extensible eye-piece sleeve. • Dust-proof, integral tube analyser with degree scale, rotating about 180°, coated Telan lens system to establish telecentric pencil of rays and eliminate astigmatism. • Filter polarizer and filter analyser of great light-transmission; neutral grey tint. • Ball-bearing, rotating stage, graduated into 360° with vernier reading to 0.1°, with clamping screw, fine rotation adjustment and click-stop device to click-stop at 45°-intervals at any desired points. • Low position, co-axial coarse and fine motions, controlled from either side. • Objectives furnished in eccentric mounts for quick and accurate alignment. • May be equipped with integral illuminator permitting illumination by the Koehler principle. • Phase Contrast Condenser and complete set of phase objectives.

CARL ZEISS, INC., 4es F,FTH AVE~ NEW YORK ,7 · Ν · γ · write for literature

Guaranteed Uninterrupted. Repair Service For farther information, circle number 72 A-3 on Readers' Service Card, page 57 A

72A

ANALYTICAL

CHEMISTRY