On the efficiency and duration of incandescent electric lamps. Report of a special committee, appointed by the president of the Franklin institute

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110 2 ‡aFranklin Institute (Philadelphia, Pa.)
245 1 0 ‡aOn the efficiency and duration of incandescent electric lamps. ‡bReport of a special committee, appointed by the president of the Franklin institute.
260 ‡aPhiladelphia, ‡bThe Franklin institute, ‡c1885.
300 ‡a127 p. incl. illus., tables. ‡b2 plans, diagrs. ‡c23 cm.
500 ‡a"Issued by authority of the Board of managers and published as a supplement to the Journal of the Franklin institute, September, 1885."
538 ‡aMode of access: Internet.
650 0 ‡aIncandescent lamps ‡xTesting.
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