International Library of Technology · Scranton, International Textbook Co. · leaf 462
25 ELECTRIC RAILWAYS. 29 the heaters are running, the main heater circuit must beopened. In Fig. 36, switch K opens and closes the heatercircuit and blade K makes the combinations correspondingto the several marked notches indicated by the dotted lineson the heater case in Fig. 37. By such an… … G^ Fig. 37. knife switch that will not be damaged to any extent by it.As long as the knife switch is open, the current is off andthe regulating switch K can be moved to any of the fournotches without danger of burning; but when K is closed,K cannot be moved at all; also, unless the regulatingswitch…
Electrical engineering
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