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Patent Drawing for T. A. Edison's Incandescent Electric Lamp

Record Group 241: Records of the Patent and Trademark OfficeSeries: Utility Patent Drawings 

Div. XVI, 176 Electric Lighting.

Lights, Incandescent.

(No Model.)

T. A. Edison.

Incandescent Electric Lamp.

No. 242,897 Patented June 14, 1881

[two illustrations of the incandescent light bulb]

[242],987 Incandescent Electric Lamp. Thos. A. Edison, Menlo Park, N. J. Filed Dec. 15, 1880 (No model.)

Claim - 1. The combination, with the incandescing conductor of an electric lamp and the key for controlling the circuit thereof, of an adjustable resistance located within the base of the lamp and cut in or out of the circuit in any desired proportion by the key, so that the lamp may be used at any desired power less than its normal capacity, substantially as set forth.

2. A carbon resistance made substantially as described, and provided with a series of metallic contacts, in combination with a key having an arm for completing circuit at any desired contact, substantially as set forth.

Attest = S. D. Mott

F. W. Howard

Inventor = Thos. A. Edison

per Dyer J. Miller

Attys.

Dec. 18, 1880 Reg.

Passed April 30, 1881