The Papers of Thomas A. Edison
Research to Development at Menlo Park, January 1879-March 1881
Publication Year: 2004
Published by: The Johns Hopkins University Press
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Calendar of Documents
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List of Editorial Headnotes
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This volume chronicles one of the most important periods in Thomas A. Edison’s career. Between January 1879 and March 1881, Edison invented a complete system of electric light and power. Although the carbon-filament incandescent lamp was the most visible element of the system, Edison and his assistants also developed a new generator, a meter, underground conductors, and fuses and lamp sockets. ...
Chronology of Thomas A. Edison, January 1879–March 1881
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Editorial Policy and User’s Guide
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List of Abbreviations
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1. January–March 1879
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At the beginning of the New Year, Edison focused his efforts largely on the project to which he had committed his laboratory in the latter half of 1878—incandescent electric lighting. On the second day of January his assistants began to make a working dynamo for the first time. ...
2. April–June 1879
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By the beginning of April Edison believed that he had succeeded at what was called subdividing the light, or operating multiple electric lamps simultaneously and independently. His laboratory demonstration in late March convinced him that one mechanical horsepower could sustain six lamps, each equal to a conventional gas jet. ...
3. July–September 1879
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Encouraged by the progress of his electric light experiments during the spring, Edison told several investors in early July that “Everything looks bright” and that he was making plans for a large demonstration of his system at Menlo Park.1 Using a dynamometer designed and built at the laboratory, he and his assistants measured the efficiency of his new dynamo. ...
4. October–December 1879
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October marked the start of a period of extraordinary activity at the Menlo Park lab, even by Edison’s unconventional standards. He confronted serious legal, administrative, and technical obstacles to the commercial use of his telephone; undertook a wholly different line of research for his electric lamp; ...
5. January–March 1880
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Having suspended virtually all work for nearly a week for the exhibition of his lighting system, Edison again closed his laboratory to the general public on 2 January. He resumed his usual routine of attending to business in the morning, reviewing the work of his assistants after midday, then working in the laboratory until the early morning, ...
6. April–June 1880
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Edison acknowledged in mid-April that a fundamental change was taking place in the nature of his work at Menlo Park. Reporters visiting the laboratory noted that he had taken most of his electric lamps out of service. ...
7. July–September 1880
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During the summer, Edison pushed ahead simultaneously with preparations both for a large-scale practical demonstration of his lighting system at Menlo Park and for the start of commercial lamp manufacture. Miles of underground electrical conductors for hundreds of outdoor street lights were in place by mid-July, after more than two months of work. ...
8. October–December 1880
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During the fall and early winter Edison found himself in the unfamiliar position of having to depend upon events and circumstances beyond his immediate control. The small-scale Menlo Park central station and distribution system he had hoped to demonstrate in the summer was still not ready. ...
9. January–March 1881
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In the early months of 1881 the work of Edison and his staff at Menlo Park was directed almost wholly toward manufacturing lamps and developing his system of electric light and power for commercial use in New York. He appointed Francis Upton to take charge of the lamp factory at the first of the year; William Hammer, another valued assistant, spent an increasing amount of time there. ...
Appendix 1. Edison’s Autobiographical Notes
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Appendix 2. Menlo Park Employees, 1879–1880
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Appendix 3. Edison Lamps (1879–1881) at the Henry Ford Museum & Greenfield Village
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Appendix 4. Edison’s U.S. Patents, January 1879–March 1881
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Page Count: 1152
Illustrations: 15 b&w photos, 383 line drawings
Publication Year: 2004
Series Title: The Papers of Thomas A. Edison
Series Editor Byline: Edited by Reese V. Jenkins, et al. Robert A. Rosenberg, Managing Editor, Book Edition