Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 260
n insulatorsshould be placed not more than 4^ feetapart; and if the wires are liable to bedisturbed, the distance between supportsshould be shortened, particularly for smallconductors. If the beams are so farapart that supports cannot be obtainedevery 4^ feet, it is necessary to provide arunning… … Fig. 23. Elevation and Plan ofInsulators Held in Angle-Iron Frames. 218
Architecture · Building · Carpentry
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