St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 122
Fig. 167. shows a cross-sedlion of moulding. The insulated wiresare placed in the slots, which are then covered. Fig. 160 shows a form of porcelain cleat. These arefastened to ceilings or walls, and firmly hold the insulatedwires in place. Fig. 161 shows a wood cleat. Fig. 162 HOW EI.ECTRIC… … 163 shows how telegraph wires are supported andinsulated. Fig. 164 shows how wires may be carried bytrees and insulated fromthem. 142. Safety Devices.We have seen that whentoo large a current passesthrough a wire, the wirebecomes heated and mayeven be melted. Buildingsare wired to use certain…
Electricity
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