The data available for 1890 shows that the year’s
experimental work was billed about $80,000, showing that
Edison’s estimate operating costs was fairly accurate. July 1901, 100521, p. Lab.
11) Insull’s notes Meadowcroft Box, #68.
13) Eaton Lewis Tate, June 1889, Miller file 121.
435.
.
3) TAE Ore Milling Syndicate, Feb 1901, 000608. Lab General.
10) TAE E.
7) Bank records Drexel, Morgan, E2530, 182.
16) Article Munsey's Magazine.H.
12) Bill Book #3, pp.
5) Edison’s Menlo Park laboratory described Robert
Friedel and Paul Israel, Edison* Electric Light (New
Brunswick: Rutgers University Press, 1986)pp. 246.
2) TAE Hood Wright, Nov 1887, N871115. July 1901, Letter Book (LB)
100521, 435.ENDNOTES FOR CHAPTER TWO
1) Article Munsey’s Magazine. Johnson, undated, 1888 Phono General.
9) One his first estimates the yearly cost running the
West Orange laboratory was:
1) Interest Investment (opportunity costs an
investment 184,000 5%) $9,200
2) Insurance $1,100
3) Depreciation 9,200
4) Supplies 7,000
5) Labor costs 62,000
This makes total yearly operating costs $88,900. Nov 1888, 1888 Phono Gen.0.
14) Draft Agreement with Villard, 1888 W.O.
8) TAE note Edison Electric Light Co, July 1887, Conot,
p.
15) TAE Review Reviews, Oct 1910, 100829, 277. Henceforth letterbooks will cited LB
number then page number. 277-278. 394, 397.
4) Batchelor Diary, 1336, Sept 1887, pp. 30-38
6) Orange Herald. TAE Memo, 1888
W
