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Twentieth century hand-book for steam engineers and electricians, with questions and answers .. (1905) Swingle, C. F. [from old catalog], Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] · Chicago, F. J. Drake & co. · leaf 522
n of these plug switchboards.Fig. 61 illustrates the successive steps for transferringthe lamps of two independent circuits from two genera-tors to one without extinguishing the lamps on eithercircuit. ELECTRICITY FOR ENGINEERS 103 4- 12 3 4 12 3 4 1 , -•(boo •—vO/—e—©■ 1, 1 1 2 3 (J • LJ LJ u • u… … FIGURE 61. 104 ELECTRICITY FOR ENGINEERS This process is a very simple example of switch-board manipulation, but illustrates the method usedfor all combinations. The location of plugs is shown by the black circles,which indicate that the corresponding bars of thehorizontal and vertical rows are… Steam engineering · Electrical engineering · Steam turbines
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