. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . of the bob-bin being connected to the case L or to the wireconnected to the switch 2. When the lamp isturned off the lever Q is in contact with n and 40the resistance R is in circuit; but when 11 islowered until the lever Q comes into contactwith x the lamp is thrown in circuit and theregulating-rod g allows more or less intimatecontact between n and Q. 45 I will mention that the case L is not necessa-rily metallic, as it may be of lime or zircon. I claim as my invention— 1. The lamp consisting of a pyroinsulatedcoi
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . of the bob-bin being connected to the case L or to the wireconnected to the switch 2. When the lamp isturned off the lever Q is in contact with n and 40the resistance R is in circuit; but when 11 islowered until the lever Q comes into contactwith x the lamp is thrown in circuit and theregulating-rod g allows more or less intimatecontact between n and Q. 45 I will mention that the case L is not necessa-rily metallic, as it may be of lime or zircon. I claim as my invention— 1. The lamp consisting of a pyroinsulatedcoiled wire, in combination with a surrounding 5Pcase that is rendered incandescent by the ra-diated heat, substantially as set forth. 2. The combination, with the electric lamp,of the thermal regulator, a resistance, and anadjusting device, n, arranged and operating 55substantially as set forth. Signed by me this 28th day of January, 1879. THOMAS A. EDISON. Witnesses: Stockton L. Griffin,J. N. Mackenzie. No. 227,229. T. A. Patented May 4, , PHOTO-LITHOGRAPHER, WASHINGTON, D. C. United States Patent Office. THOMAS A. EDISON, OF MENLO PAEK, JSTEW LIGHT. SPECIFICATION forming part of Letters Patent No. 227,229, dated May 4, 1880. Application filed April 21, 1370. To all whom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the State of New Jersey, haveinvented an Improvement in Electric Lights,5 (Case iTo. 176,) of which the folio wing is a speci-fication. When platina and other metals that fuse ata high temperature are exposed to high heatand then cooled in the atmosphere they are10 injured, so that they are. not well adapted touse in electric lights for a long period of time. I inclose the conductor that forms the elec-tric candle in a transparent case and heat thesame gradually to expel any gases from the15 material of the candle. I form a vacuum inthe transparent case and then seal the sameherme
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