A few nice wire electric discharge machining images I found:
Image from page 147 of “An international system of electro-therapeutics : for students, general practitioners, and specialists” (1894)
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Identifier: internationalsys00bige
Title: An international system of electro-therapeutics : for students, general practitioners, and specialists
Year: 1894 (1890s)
Authors: Bigelow, Horatio R. (Horatio Ripley) Massey, George Betton, 1856-1927 Prince, Morton, 1854-1929 Jacobi, Mary Putnam, 1842-1906 Hayes, Plymmon Sandford, 1850-
Subjects: Electrotherapeutics Hysteria Uterus Electric Stimulation Therapy Uterus Hysteria
Publisher: Philadelphia : F. A. Davis London : F.J. Rebman
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chouc, which has been slightlyrubbed on the clothes, either above or below the middle of the drum(corresponding with the middle of the inner vertical double comb). Thisexciting or charging of the machine is manifested by a whizzing sound.If the motion be stopped, the electric charge of the cylinders lasts forseveral hours. If the handle be turned in the opposite direction, themachine does not become uncharged. Atkinsons Toepler electric machine is an electro-static machine, of A-106 McCLURE. high tension and large quantity, whose sensitiveness to atmosphericinfluences does not interfere with its practical working. It is made withtwo circular plates of glass, one stationary, the other revolving close infront of it; two sets of combs and two Le3^den jars, with a switch betweenthem. To the back of the stationary plate are attached two sets of paperand tin-foil inductors, connected with which are two wire brushes, and tothe front of the revolving plate are attached six metal carriers with
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Fig. 6.—Atkinsons Toepler Electkic Machine China. raised centres, which are brought into contact with the brushes as theplate revolves, and generate the electric charge, which is rapidly increasedby induction. Opposite parts of the plates and opposite inductors andcarriers become oppositely electrified, condensation takes place in the jars,and sparks pass between the sliding electrodes, which may be increasedto seven inches or more in length. Electricity is generated at once, andthe electric charge constantly sustained by the friction of the carriers STATIC ELECTRICITY AND MAGNETISM. A-107 and brushes ; heuce the machine remains in practical working-order underthe most unfavorable atmospheric conditions. The switch, as seen in the cut, is placed between the Leyden jars,and in connection with their outer coatings, so that the induced currentbetween them is controlled by the operator. As this current flows atthe same instant with the discharge between the sliding electrodes
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Image from page 950 of “Electric railway journal” (1908)
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Identifier: electricrailway551920newy
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: [New York] McGraw Hill Pub. Co
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ower. United Railways & Electric Com-pany. After passing interlocking territory the electric carsproceed to the prepayment area, discharge their pas-sengers and proceed around the loop. Most of the carsthat run to the shipyards, after completing their morn-ing work, are stored on the inbound track during theday, a shuttle car being operated on the outbound trackfrom about 9:30 to 2 and a two-car train shuttle from2 to 4. The latter is necessary on account of the com-ing of the men to work for the afternoon shift. Thisshuttle connects at the interlocking tower with themain-line service. There is more or less casual travelbetween the shipyard office and the city, which makesit imperative to provide this shuttle service duringthe hours when the demands for traffic do not necessi-tate through service. A representative of the trans-portation department is located at the shipyard all dayand has supervision of the operation and storing ofcars. During the day a representative of the shops
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AT LEFT, SIGNAL TOWER AT CROSSING OF MAIN TRACK OF P. R. R. AND DOUBLE TRACK OF U. R. & E. CO.AT RIGHT, INTERLOCKING MACHINE IN SIGNAL TOWER display four lights of yellowish tinge in a horizontalline for stop and four in a vertical line for proceed.The position dwarf signals have two lights horizontalfor stop and two at 45 deg. for proceed. All track-circuit apparatus is of the Union Switch &Signal Companys manufacture, with latest model 15vane-type relays. Compressed air is distributed by 1-in. galvanizedpipe and wires in grooved lumber, both mounted onsame concrete foundations placed every 7 ft. Power for the air compressors is supplied from theU. R. & E. Companys 600-volt feeders and the alter-nating current for signals, switch valves and trackcircuits is secured from the 2200-volt, 25-cycle mainsused in the U. R. & E. Companys signal system, steppeddown to 110 volts. The plant was designed and installed by the UnionSwitch & Signal Company in accordance with spe
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Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability – coloration and appearance of these illustrations may not perfectly resemble the original work.