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{{short description|American assistant to Thomas Edison}}
{{Infobox person
| name = Francis Jehl
| image =Sitting L. to R.- Charles L. Clarke, John W. Howell, John W. Lieb; standing L. to R.- Francis Jehl, Frank A. Wardlaw, Charles (584fa92b5d5b4bc2b57ef590b452333e).jpg
| caption =Jehl (bottom left) in 1923.
| birth_date = {{birth date|1860|09|06}}
| birth_place = [[New York, New York]]
| death_date = {{death date and age|1941|02|11|1860|09|11}}
| death_place = [[St. Petersburg, Florida]]
| occupation = [[Inventor]]
| spouse =
| website =
}}
'''Francis Jehl''' (September 6, 1860 - February 11, 1941) was a laboratory assistant of [[Thomas Edison]]. Jehl studied chemistry at [[Cooper Union]] at night. After finishing school at the age of 18, he went to work for Edison at [[Edison, New Jersey|Menlo Park]].
In 1882, Jehl went to Europe to introduce the [[Edison Electric Light Company|Edison light system]] in the various European countries. Jehl wrote a book titled ''Reminiscences of Menlo Park'' based on a diary of his experiences at the laboratory.
== History ==
Before Jehl worked for Edison he worked for '''Grosvenor Lowrey''', who was the chief counsel of [[Western Union Telegraph Company]]. When Jehl worked for Lowrey he was responsible for making multiple copies of a wide range of documents pertaining to Edison’s electric pen. Some of the other duties that came with Jehl’s employment with Lowrey was overseeing the care of Bunsen cells which happened to occupy the current of the electric pen. ▼
▲Before Jehl worked for Edison he worked for
In 1879, Jehl began his employment with Edison. He was responsible for maintaining 50 or so Bunsen cells on a variety of tables on the second floor of the laboratory. After the completion of Jehl’s first assignment, Edison noticed Jehl’s work ethic and he was so impressed that he gave Jehl a job to work more closely with him. Jehl worked on the electric light during the laboratory stage of development. Jehl was responsible for performing many experiments and tests; however, some of the most important were those that were related to the electric meter for the central stations. Edison had given Jehl specific instructions to keep him informed daily with the tests and experiments that he conducted and the results obtained. With the results that Edison received from Jehl, he was able to make informed decisions on how to create things, like the thermal regulator for the meter.▼
▲In February 1879
The city of [[Brno]] opted for electric lighting for the [[Mahen Theatre]] in 1882 and contracted the Edison company to supply the lighting system. Jehl supervised the installation.<ref>{{cite web | title=About the Memory of a Theatre | url=http://www.ndbrno.cz/en/about-us/theatre-buildings/mahen-theatre/history-of-mahen-theatre/history-mt/ | publisher=[[National Theatre (Brno)]] – Official website | date= | accessdate=2009-08-30 | archiveurl=https://web.archive.org/web/20081222025225/http://www.ndbrno.cz/en/about-us/theatre-buildings/mahen-theatre/history-of-mahen-theatre/history-mt/ | archivedate=2008-12-22}}</ref> After the [[International Electrical Congress]] in 1881 there was a strong demand for Edison’s products, so Jehl and coworkers conducted Edison’s business in Europe. They promulgated the [[watt-hour meter]] and [[parallel circuit]] [[distribution grid]] that Edison had developed with his team including [[Francis Upton]].
During the two years that Jehl spent at '''Menlo Park''', he kept a personal diary. This diary detailed some of the exceptional things that he personally witnessed during his employment there. This diary was the foundation for Jehl’s personal book, titled '''Reminiscences of Menlo Park''', which happened to be published fifty years afterwards.▼
▲During the two years that Jehl spent at
Jehl died on February 11, 1941 in [[St, Petersburg, Florida]] at the age of 80. Jehl was one of the last surviving associates to Thomas Edison, whom assisted with the creation of the incandescent light. Jehl was survived by his wife, and son Fred Jehl, in Budapest, Hungary▼
==
▲Jehl died on February 11, 1941, in [[St
* Francis Jehl Dies; An Edison Pioneer. (New York Times, February 11th, 1941), p 24▼
== Bibliography ==
* Isreal, Paul. Edison: A Life of Invention. (New York, NY: Wiley & Sons, Inc.), 1998▼
* 1899: [https://archive.org/details/manufactureofcar00jehluoft The Manufacture of Carbons for Electric Lighting and Other Purposes] via [[Internet Archive]]
* 1937: [https://babel.hathitrust.org/cgi/pt?id=mdp.39015071173150;view=1up;seq=5 Menlo Park Reminiscences, volume 1], [[Edison Institute]] via [[HathiTrust]]
* 1939: [https://babel.hathitrust.org/cgi/pt?id=mdp.39015043598534;view=1up;seq=7 Menlo Park Reminiscences, volume 2], Edison Institute via HathiTrust
* 1941: [https://babel.hathitrust.org/cgi/pt?id=mdp.39015011388298;view=1up;seq=7 Menlo Park Reminiscences, volume 3], Edison Institute via HathiTrust
== References ==
* Jehl, Francis. Working with Edison. (New York Times, July 26th, 1936), p BR 12▼
{{Reflist}}
▲* "Francis Jehl Dies; An Edison Pioneer
* Josephson, Matthew. Edison: A Biography. (New York, NY: McGraw-Hill), 1959▼
▲*
▲* Jehl, Francis
* Vanderbilt, Bryon M. (1971) ''Thomas Edison, Chemist
{{Authority control}}
▲* Vanderbilt, Bryon M. Thomas Edison, Chemist. (Washington, D.C.: American Chemical Society), 1971
{{DEFAULTSORT:Jehl, Francis}}
[[Category:American inventors]]
[[Category:1860 births]]
[[Category:1941 deaths]]
[[Category:Edison Pioneers]]
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