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Figure 19.—The electric elevator in its earliest commercial form (1891),
with the motor connected directly to the load. By this time, incandescent
lighting circuits in large cities were sufficiently extensive to make such
installations practical. However, capacity and lift were severely limited by
weaknesses of the control system and the necessity of using a drum.
(From Electrical World, Jan. 2, 1897, vol. 20, p. xcvii.)
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Figure 20.—Advertisement for the Miller screw-hoisting machine, about 1867 (see p. [23]).
From flyer in the United States National Museum.
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