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Housings, frames, spiders, all stationary parts were rough, crude and massive; but bearings, shafts, armatures, all moving parts, were of a polished and finished accuracy and balance that promised months and years of trouble-free operation. Everything ready for the test, Stevens took off his frayed and torn leather coveralls and moccasins and climbed nimbly up the penstock. He never walked down.
And likewise to this end the combined resistance of the generator armatures in multiple arc was kept relatively small by adjusting the number of generators operating in multiple at any time to the number of lamps then in use.
A mere recital by titles of the vast number of experiments and tests on carbons, lamps, dynamos, armatures, commutators, windings, systems, regulators, sockets, vacuum-pumps, and the thousand and one details relating to the subject in general, originated by Edison, and methodically and systematically carried on under his general direction, would fill a great many pages here, and even then would serve only to convey a confused impression of ceaseless probing.
Tight joints are formed at every point by rubber or leather washers. In the center of the lantern is placed the incandescent lamp. This is held in a socket, and is provided with two armatures to which the platinum wires are soldered. Two terminals, b, are affixed to the lamp socket. Beneath the lantern there is a cylindrical box provided with a screw cap.
The heating of solid armatures, the only kind then known, and poor insulation in the commutators, also gave rise to serious losses.
This is composed of some twenty blind people, sixteen men and four women, and they have been taught to wind coils for armatures used in electric motors and mill machinery. These people earn from a dollar and a half to two dollars a day, and their work is done as well as that of the sighted employees, though, just at first, a little more time is required.
After Edison had decided this question, Upton made drawings and tables from which the real armatures were wound and connected to the commutator.
These converged finally in the Forks, which, leaping and plunging steadily downward from a height of over six thousand feet, was trapped and used again and again to turn the armatures of Baker's dynamos.
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