Dr. Haid has not yet furnished the treated plumbago loops although he promises them daily. Achison has perfected a system to do this and has already turned out 5000; wants to come to factory to learn how to make lamps so that he can go into business in France. Upton wants to stop making lamps for time being so that they can concentrate on making A and B carbons. Has enough fiber on hand to keep running for at least 4 months. Upton also reports an accident during vacuum pumping of lamps, ruining about 150. Accident due to wires Nichol ran which failed b/c leaky steam valve causing short. "[S]carcely a day passes without a new 'bug' showing itself." However, has turned out about 1000 lamps with good vacuum, well plated, and low-resistance carbonization. ANNOTE WITH D8124F810404 Consider for inclusion: gives good insight into early lamp production and problems associated with it. (DH)

Upton, Francis Robbins

Edison, Thomas Alva

Acheson, Edward Goodrich

Haid, Alfred

Moore, William H

Nichols, Edward Leamington

Dyer, Philip Sidney

Hammer, William Joseph

1881-04-18

1880-1889

Letter

Production difficulties and adjustments

Incandescent lamp

D8123ZAZ

D8123

[D8123ZAZ], Letter from Francis Robbins Upton to Thomas Alva Edison, April 18th, 1881

57:853

Thomas Edison National Historical Park

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