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predetermined t e m p e r a t u r e by m e a n s of a n adjustable t h e r m o s t a t . T h e h e a t e r h a s a t i n n e d copper t a n k of 1 VVgallon capacity. I t is supplied with a pilot light, dial t h e r m o m e t e r , cord, a n d switch. T h e 650-watt h e a t i n g unit operates on Π 0 or 220 volts. 12 Surface Tensiometer of
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. . . a i t the ways you might use it profitably — for example, to initiate, accelerate, and control chemical reactions, clean delicate or complex parts, emulsify immiscible liquids, degas liquids, deagglomerate particle .sus pensions, accelerate precipitations, poly m e r i z e or de ρ ο I y m e r i 2 e ο r ga η i c s, ο r e l e c t r o p l a t e ?,·...··'. ... . that lab and production ultrasonic equip-, ment is now available from $250 to $500 ? McKenna Model 100 for lab ?nd production use
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. . . that this equipment often pays for itself in less than a month —sometimes'in a day?
MCKENNA
LABORATORIES
2503 Main St., Santa Monica, Calif.
For further information, circle number 56 A-1 on Readers' Service Card, page 49 A
S a v e Time . . . E f f o r t . . . Steps
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A Cassel t y p e tensiometer capable measuring t h e surface tension of liquids over a wide t e m p e r a t u r e range is being produced by N a t i o n a l I n s t r u m e n t Labora tories, I n c . Sam ple requirement for t h e i n s t r u m e n t is only 0.02 ml. Closed chamber construction per mits surface ten sion t o be meas ured in a n v desired
T h e i n s t r u m e n t operates b y measuring the m a x i m u m pressure a t t a i n a b l e inside a small bubble. T h e bubble is formed over an orifice, so t h a t no corrections for hydrostatic head of liquid need be a p plied. Components of t h e tensiometer in clude t h e small orifice on which t h e bubble forms, a piston for applying gas pressure inside t h e forming bubble, and a m a n o m e t e r for measuring t h e gas pres sure. T h e sample a n d orifice a r e situ ated inside a jacketed chamber near a t h e r m o m e t e r . Orifices of various sizes can be provided. ΐ 3 Volumetric Flask
TALK/LISTEN The most convenient and efficient way to communicate between labs and offices is TALK-0. Simple to hook-up, simple to use . . . Person calling from any TALK-0 Master station can talk, then listen by pressing same key; person called may answer from any where in room without interrupting his work. Any number from 2 to 11 stations may be linked together for instant, private com munication. No interference from lab equipment. TALK-0 stations are small, attractive and easily located. WRITE FOR FULL DETAILS
ROCHESTER SCIENTIFIC CO. 38 SCIO STREET • ROCHESTER 1, NEW YORK For further information, circle number 56 A-2 on Readers' Service Card, page 49 A
56 A
A Cassia volumetric flask with a larger b o d y a n d more accurate neck h a s been designed b y K i m b l e Glass Co. t o meet t h e requirements of t h e Essential Oil Association. T h e flask is said to be suitable for assay of oil of lemon grass, as well as oils of cinnamon, cheno-j podium, cloves, a n d spearmint. T h e neck of t h e flask h a s rings a n d n u m b e r s each 1 ml., with subdivisions of 0.1 ml. Average capacity is 150 ml. 14 Light-Scattering Photometer T h e Brice-Phoenix Universal 1000 Series light-scattering photometer h a s been developed b y t h e Phoenix P r e cision I n s t r u m e n t Co. for measuring microscattering, microfluorescence, m i croluminescence, a n d very low t r a n s m i t t a n c e and reflectance of d a r k m a terials. T h e self-contained i n s t r u m e n t For further information, see coupon on page 49 A ANALYTICAL
CHEMISTRY
