[D8523ZAE], Letter from William Symes Andrews to Thomas Alva Edison, April 7th, 1885


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[D8523ZAE], Letter from William Symes Andrews to Thomas Alva Edison, April 7th, 1885

Editor's Notes

[from Harrisburg] The question of City Lighting is now being seriously considered by the Directors of the Harrisburg Illuminating Co. There will be about 500 lights and the district is about 3 miles long, with Light Stations midway between the extremities. They want 20 candlepower lamps and expect to get liberal pay. One of the chief difficulties that arises in the Municipal System is the limited number of lamps in one loop, which would necessitate on long distances some arrangement of loops like this: [diagram drawn in original]. Would it be possible to make 20 CP lamps "of say 20 volts" so that we could get 40 lamps in service on one 800 volt circuit, or 80 on double that EMF? Then we could have a resistance box in the Station on each loop and render more perfect our control of current. And we could start with a certain amount of resistance in each circuit, and then provide for the contingency of having to put in an occasional additional lamp, which is very often called for. Is there any absolute minimum limit of resistance for incandescent lamps in series? Hope to be in NY in a few days and will talk this over with you. [Marg]: Insull shorthand.




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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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