EDISON, THOMAS ALVA. Autograph letter signed ("Thomas A. Edison," with large "umbrella" paraph) addressed "to whom it may concern," Jamaica; Orange, N.J., 21 January 1887. 1 page, 8vo, 203 x 126 mm. (8 x 4 7/8 in.), integral blank, with original postmarked envelope addressed in Edison's hand. EDISON'S SEARCH FOR A FIBRE FOR LIGHT-BULB FILAMENTS A very good letter regarding Edison's extended and exhaustive search for the proper filament for use in the incandescent light bulb. "The bearer, Mr. H. de C. Hamilton, accompanied by Mr. A.C. Payne are assistants from my Laboratory who are making a trip among the West India Islands in search of vegetable fibre capable of being used in Electroc Flow Lamps; any attention shown them will be greatly appreciated...." Indoor electric lighting became practical only with Edison's incandescent lamp and the establishment of central power stations. The first such station, established in Manhattan in 1882, supplied 59 customers with a total of 1284 sockets. Carbon filaments connected by platinum wires in a vacuum vessel were found to give the most efficient light when energized. Initially, Edison used a process whereby purified cotton-wool was dissolved in zinc chloride and formed into thin threads under pressure, then carbonized at high temperature, but he spent years in search of the best natural fiber from which the carbonized filament could be produced. Thousands of plant and animal fibers were collected by Edison's agents, returned to the lab, and carefully tested. General interior lighting did not become feasible on a large scale until the introduction of very efficient tungsten, tantalum and other metallic filament lamps.
EDISON, THOMAS ALVA. Autograph letter signed ("Thomas A. Edison," with large "umbrella" paraph) addressed "to whom it may concern," Jamaica; Orange, N.J., 21 January 1887. 1 page, 8vo, 203 x 126 mm. (8 x 4 7/8 in.), integral blank, with original postmarked envelope addressed in Edison's hand. EDISON'S SEARCH FOR A FIBRE FOR LIGHT-BULB FILAMENTS A very good letter regarding Edison's extended and exhaustive search for the proper filament for use in the incandescent light bulb. "The bearer, Mr. H. de C. Hamilton, accompanied by Mr. A.C. Payne are assistants from my Laboratory who are making a trip among the West India Islands in search of vegetable fibre capable of being used in Electroc Flow Lamps; any attention shown them will be greatly appreciated...." Indoor electric lighting became practical only with Edison's incandescent lamp and the establishment of central power stations. The first such station, established in Manhattan in 1882, supplied 59 customers with a total of 1284 sockets. Carbon filaments connected by platinum wires in a vacuum vessel were found to give the most efficient light when energized. Initially, Edison used a process whereby purified cotton-wool was dissolved in zinc chloride and formed into thin threads under pressure, then carbonized at high temperature, but he spent years in search of the best natural fiber from which the carbonized filament could be produced. Thousands of plant and animal fibers were collected by Edison's agents, returned to the lab, and carefully tested. General interior lighting did not become feasible on a large scale until the introduction of very efficient tungsten, tantalum and other metallic filament lamps.
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