Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 300
remust be a heat coil on each side of the line. The heat coil is designedto warm up and melt out with a current large enough to endangerthe instruments if continued for a long time, but so small that itwould not blow the fuses ordinarily found necessary for such instru-ments. The smaller currents… … Fig. 136. Common Form of Telephone Protector necessary. The fuses must be so placed as to protect the arresterand heat coils, and the protector terminals must be plainly markedline, instrument, or ground. The relative arrangement of parts is shown in diagram in Fig.135 and a common form of…
Electrical engineering
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