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A Scene From America's Projector Carbon Center...
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Equipment for coating carbons with copper
Coating projector carbons with the right amount of copper is a top-billing production step"
Sid Morley
This equipment performs the important task of coating projector carbons with copper— not for eye appeal, but for the vital purpose of assuring more dependable screen lighting. The coating helps conduct current from the jaws of the lamp to the arc. For maximum light efficiency the copper coating must be of precision thickness— no more— no less!
From the coating operation at "America's Projector Carbon Center" in Fostoria, Ohio, National carbons move to an automatic resistance test, where a direct reading instrument
-says SID MORLEY
"National" Sales Engineer
measures in ohms-per-inch the coating on each carbon. If the coating is too thin or too thick, the unwanted carbon is ejected from the fine.
How is this rigid test related to good fighting? First, if the coating is too thin, the carbon might spindle back to the holder, resulting in freezing and a possible lamp shutdown. Secondly, if too thick, it might produce copper dripping and cause the arc to wander.
In coating and all other manufacturing steps, National carbons are produced by today's most reliable quality control methods. We want to be sure your patrons get the finest screen lighting that projector carbon money can buy !
UNION CARBIDE
National" is a registered trade-mark of
UNION CARBIDE CORPORATION
CARBON PRODUCTS DIVISION
270 Park Ave., N. Y., N. Y. 10017 • In Canada: Union Carbide Canada Limited, Toronto