This spark aids in reducing casting costs!
Bridgeport Brass Company uses emission spectroscopy for fast, accurate alloy composition analysis The extended casting of off-mixture metal can prove very costly in both metal loss and equipment downtime. Emis sion spectroscopy is proving invaluable as a means of accurately measuring impure elements and alloy constitu ents in a matter of minutes. Pour samples are sent immediately to the laboratory from furnace platforms through a system of pneumatic tubes. The sample is prepared in the laboratory and excited using pre-arranged source conditions. "National" graphite rods are used as a counter-electrode in this application. Results — obtained quickly and economically by direct
reading spectroscopy — permit Bridgeport Brass Company to maintain elements and impurities within the limit of metallurgical standards.
NATIONAL GRAPHITE helps measure these elements and impurities "National" graphite rods —the purest graphite obtainable — are being used for analysis of 95 to 100 per cent of all castings produced from induction, arc and continuous casting furnaces, at Bridgeport Brass Company. Be sure to specify "National" for your spectroscopic work. This brand of graphite in electrode or powder form, is accompanied by a "statement of purity" describing the trace-elements present. You are thus forewarned against errors arising from unexpected spectral lines. ΛΛΛ,, UNION CARBIDE
"National" and "Union Carbide" are registered trade-marks of Union Carbide Corporation N A T I O N A L C A R B O N C O M P A N Y • Division of Union Carbide Corporation · 30 East 42nd Street, New York 17, N.Y. "'""^W^"' "~ Soles Offices: Atlanta, Chicago, Dallas, Kansas City, Los Angeles, New York, Pittsburgh, San Francisco. In Canada: Union Carbide Canada Limited, Toronto. For further information, circle number 47 A on Readers' Service Card, page 89 A
VOL. 30, NO. 6, JUNE 1958
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47 A
