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 m?ny laboratory experi­ments where even a slight error co i 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 Px 'REX brand laboratory ware. Take volumetric ware, for example. The A plainly marked on its surface indicates Guajcanteed 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. The exceptionally low thermal expansion of the glass itself is added assurance of accuracy and reliability. And it reduces breakage and outs replacement costs.

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

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

PYREX brand Class A V o l u ­metric Flasks —Guaranteed Class A capacity tolerances as prescribed by the National Bureau of Stand­ards, plus Coming's own standards of precision workmanship are your assurances of accuracy·

PYREX brand Precision Bore Burettes meet tolerances estab­lished by Β of S circular Ç-434. Body of precision bore tubing adds extra accuracy between a n y two points*

the laboratory glassware..that gives you economy, accuracy, durability

CORNING GLASS WORKS, Corning, New York

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