accuracy/ is important in Laboratory Glassware, too

That sea gull can't afford to miss: If he isn't right "on tar­get," he goes hungry.

The same principle holds true for many laboratory experi­ments where even a slight error could result in failure. That 's why it always pays to use equipment that you know is accurate.

You can depend on accuracy when you use PYREX brand laboratory ware. Take volumetric ware , for example. The A plainly marked on its surface indicates Guaranteed Class A capacity tolerances as prescribed by the National Bureau of Standards.

Or, use transfer pipettes, precision bore burettes, gradu­ated cylinders or any of hundreds of other PYREX labora­tory ware items as your criteria.

Each is designed and manufactured to closest tolerances, rigidly inspected and precisely calibrated. T h e exceptionally low thermal expansion of the glass itself is added assurance of accuracy and reliability. And i t reduces breakage and cuts replacement costs.

Your laboratory supplies dealer stocks the complete line of PYREX brand laboratory ware. H e will b e glad to help you in planning your requirements. Call him today.

PYREX b r a n d Pipettes are avail­able in all standard sizes and types. Whether for transfer or measuring, you can be sure of their accuracy.

PYREX b r a n d Class A Vo lu ­metric Flasks —Guaranteed Class A capacity tolerances as prescribed by the National Bureau of Stand· ords, plus Coming's own standards o f precision workmanship are your assurances of accuracy.

^ ^ W fe^f (fe* &K the laboratory glassware that gives you economy, accuracy, durability

PYREX brand Precision Bore Burettes meet tolerances estab­lished by Β of S circular C-434. Body of precision bore tubing adds extra accuracy between any two points.

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CORNING GLASS WORKS, Corning, New York

C H E M I C A L A N D E N G I N E E R I N G N E W S

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