. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . ELFXTRIC RATLAVAVS. 29 the heaters are running, the main heater circuit must beopened. In Fig. 3(i, switch A opens and closes the heatercircuit and blade A makes the combinations correspondingto the several marked notches indicated by the dotted lineson the heater case in Fig. 37. By such an arrangement, alltendency to blister and burn is confined to a quick-break. knife switch that will not be damaged to any extent by long as the knife switch is open, the current is off andthe
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . ELFXTRIC RATLAVAVS. 29 the heaters are running, the main heater circuit must beopened. In Fig. 3(i, switch A opens and closes the heatercircuit and blade A makes the combinations correspondingto the several marked notches indicated by the dotted lineson the heater case in Fig. 37. By such an arrangement, alltendency to blister and burn is confined to a quick-break. knife switch that will not be damaged to any extent by 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 regulating-switch is exactly on the notch, switch A cannot be closed. 35. Fig. ;37 is a diagrammatic sketch of the connectionsof the Johns heater switch. In the figure, the switch is at
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
