. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . designedto give sixteen I claim is—5 3. The method of treating the carbon fila-ment of an incandescing electric lamp, con-sisting in raising such carbon filament to in-candescence during the latter part of the pro-cess of exhausting the lamp-globe, whereby the eo air and gas are driven from the carbon fila-ment and the flexibility of the filament is in-creased, substantially as set forth. 2. The method of treating the carbon fila-ment of an incandescing electric lamp, con- 15 sjstiug in raising suc
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . designedto give sixteen I claim is—5 3. The method of treating the carbon fila-ment of an incandescing electric lamp, con-sisting in raising such carbon filament to in-candescence during the latter part of the pro-cess of exhausting the lamp-globe, whereby the eo air and gas are driven from the carbon fila-ment and the flexibility of the filament is in-creased, substantially as set forth. 2. The method of treating the carbon fila-ment of an incandescing electric lamp, con- 15 sjstiug in raising such carbon filament to a higher incandescence than that at which it isdesigned to be used during the latter part ofthe process of exhausting the lamp-globe,whereby the air and gas are driven from thecarbon filament and from its enlarged endsand clamps, and the flexibility of such fila-ment is increased and its shape fixed, substan-tially as set forth. This specification signed and witnessed this11th day of December, 1880. THOS. A. EDISON. Witnesses: H. W. Seely,Wm. (No Model.) 2 Sheets—Sheet 1. T. A. EDISON. ELECTRO MAGNETIC RAILWAY ENGINE. No. 265,778. Patented Oct. 10, 1882.
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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
