It's the extras you may never need that count most It's a matter of record that Corning builds into PYREX stopcocks more service than you may ever need. These stopcocks embody all the refinements that 29 years of research have developed. Sturdy outer shells and heavy side arms are expertly welded together b y rugged seals, perfectly annealed. The solid plugs are made of No. 7 7 4 glass / the same "balanced" chemical glass used for the shells (and all of your other PYREX laboratory glassware). Each part is accurately ground to assure interchangeability and to make possible a quick, simple lapping operation if vacuum service is indicated.
Such inbuilt quality by Corning means . . . 1. L o n g s e r v i c e life 2. S m o o t h o p e r a t i o n , m i n i m u m o£ "freezing" 3. D e p e n d a b i l i t y i n t o u g h service 4. Easy r e p l a c e m e n t of p a r t s Look for the PYREX trademark on both shell and plug. It assures you of the finest stopcocks that years of experience can produce. Consult your dealer on your stopcock requirements. He stocks PYREX brand laboratory ware for you. For latest price information write us today for your copy of Supplement No. 3 to Corning Catalog LP-24.
CORNING
GLASS
WORKS
TECHNICAL PRODUCTS D I V I S I O N C O R N I N G , NEW YORK LABORATORY GLASSWARE OPTICAL CLASS GLASS COMPONENTS GLASS PIPE GAUGE GLASSES LIGHTINGWARE SIGNALWARE
LABORATORY GLASSWARE • . . stocked by leading laboratory supply houses
the mark of Corning Craftsmanship
"PYREX" IS A RIGISTERED TRADE-MÀRK AND INDICATES MANUFACTURE BY CORNING GLASS WORKS, CORNING, Ν. Υ. V O L U M E
2 5,
NO.
11
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MARCH
17,
1947
811
