[D8430V], Letter from Edison Lamp Co to Thomas Alva Edison, July 21st, 1884

Item

Abstract

The calculations of life on Swan lamps, sent you in our memorandum of July 18, were made from the law derived from experiments on our own lamps: viz. The life varies inversely as the 365[?] power of the candle-power. The fact that the life calculated from the 20 c.p lamps, is so different from that calculated from the 60 c.p. lamps, would seem to show, as you say, taht the Swan lamps do not follow the same law, as to candle-power and life, as ours do. TAE marg: E

Date

1884-07-21

Decade

1880-1889

Type

Identifier

D8430V

Folder Set

D8430

Title

[D8430V], Letter from Edison Lamp Co to Thomas Alva Edison, July 21st, 1884

Microfilm ID

73:539

Publisher

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