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no date - what were formerly spilled and wasted heat rays are now collected, reflected down to the heat area, and put to practical use for heating

HEAT LAMP

E&MP 12.018

Electric Appliances & Apparatus

no date

Silver ring on the "bullseye" type of heat lamp eliminates "heat spill" by bringing within the control of the reflector all heat rays except those that come directly down to the heating area.

The result is that what were formerly spilled and wasted heat rays are now collected, reflected down to the heat area, and put to practical use for heating.

see diagram 012.017

Original Caption by Science Service
© Westinghouse



National Museum of American History

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