. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (Model.) No. 239,153. 2 Sheets—Sheet 2. T. A. Lamp. Patented March 22, United States Patent Office. THOMAS A. EDISON, OP MENLO PAEK, NEW LAMP. SPECIFICATION forming part of Letters Patent No. 239,153, dated March 22, 1881. Application filed August 27, 1860. (Model.) To all ivliom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented a new and5 useful Improvement in Electric Lamps; andI do hereby decl
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . (Model.) No. 239,153. 2 Sheets—Sheet 2. T. A. Lamp. Patented March 22, United States Patent Office. THOMAS A. EDISON, OP MENLO PAEK, NEW LAMP. SPECIFICATION forming part of Letters Patent No. 239,153, dated March 22, 1881. Application filed August 27, 1860. (Model.) To all ivliom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented a new and5 useful Improvement in Electric Lamps; andI do hereby declare that the following is a fulland exact description of the same, reference be-ing had to the accompanying drawings, andto the letters of reference marked thereou. io As is well known, the electric lamp used in mysystem is a filament of high-resistance flexiblecarbon inclosed in a hermetically - sealed ex-hausted glass inclosing-globe, conductors lead-ing to the carbon being sealed into the globe. 15 As these conductors are metallic and goodconductors of heat, they may heat to a consid-erable degree, even to the points where theyare sealed into the glass, when, owi
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