objective lenses of any standard microscope and revolves along with the other objectives in the nose piece. Heart of the system is a half-aluminized plate which first passes light rays and then, when they are reflected back to it by a surface mirror, reflects the rays correctly positioned for viewing by the objective. 10 Hot Plate Thermo Electric Mfg. Co. is producing a hot plate measuring 9 inches square and 6 inches high for heavy duty service. It has a cast iron top plate and a stainless steel body. The body is in two sections separated by an insulating plate, and the heating plate itself is insulated and suspended in the top section with ventilating air channels underneath and on all four sides. Temperatures are regulated by a fourway switch providing surface temperatures of 400°, 535°, 710°, and 930° F. Units operate on 115 or 230 volts a.c. 11
ME TRUBOREST/RRERf THEORiGINAL AND THE BEST
7reeis/or?-15ore Glass Stirrer OFTEN /M/TATED NEVER EQUALLED 7Â*. Mat I4aca£f ZaacSw 2*4 ZiS. 7ot^y
THE STANDARD SINCE T940
Electrophoresis Apparatus
E-C Apparatus Co. is marketing an electrophoresis apparatus that can analyze up to 12 samples simultaneously under identical conditions of temperature and ionic strength. It can be used to determine mobilities of mixture components at three pH levels at the same time. The unit is constructed of Plexiglas, with permanently attached platinum electrodes. The migration chamber will accommodate paper sheets or starch columns up to 4 cm. thick and provides water cooled surfaces in contact with the paper or starch column. Unit operates at 1000 volts d.c. or less. 12 X-Ray Diffraction Camera
Designed for general purpose investigations of substances at controlled temperatures up to 1000° C. is the Model HC-101 high temperature x-ray diffraction powder camera of Central Research Laboratories, Inc.
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Imitation may be the sheerest flattery — but You are entitled to the Ace Trubore Stirrer. The Exclusive Ace Process provides the closest of rod and bearing tolerances—unmatched precision. Accurate tests show an average leak rate of but 6.4 mm. H g / M i n . (unlubricated) at 7 6 0 mm.Hg/min.differential pressure. For lubricated stirrers, leakage is less than 0.05 mm. Hg/min. for the same pressure differential.
Ace Trubore Stirrers are made in various styles to meet unusual needs, such as a unit which permits the inert gas to be fed into and over the contents of the flask while stirrer is in motion. This same unit is also adapted to gasliquid or liquid-solid reactions. All bearings and rods of Ace Trubore Stirrers are fully interchangeable.
ACE Trubore Stirrer Rods and bearing are stocked in a complete range of standard taper joints, and ACE standard interchangeable spherical joints. Blades are available in TEFLON or Glass When it comes to stirrers, don't be satisfied with less than the Original and Genuine ACE TRUBORE Stirrer . . . the f i n e s t . . . the most widely used . . . the most versatile . . . and truly economical. You Can "Always Rely on Ace" Write DEP'T "TS-D" for Detailed Brochure
The camera has a movable film carrier that allows five 7-mm. diffraction patFor further information, see coupon on page 49 A V O L U M E 26, NO. 4, APRIL 1 9 S 4
ACE GLASS VINELAND
INCORPORATED NEW JERSEY
For further information, circle number 53 A on Readers' Service Card, page 49 A
53 A
