Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 249
Fig. 4. A100-Foot Coil of Flexible Steel Conduit.Courtesy of Sprugue Electric Co., New York, N. Y. 206 ELECTRIC WIRING for the steel conduit. Care is taken in forming the cable, to avoidcrushing or abraiding the insulation on the conductors as the steel … Fig. 5. Outlet Box for Flexible Steel Conduit. strips are fed and formed over the same. In the process of manufac-ture, the spools of steel ribbon are of irregular length, and when a
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