Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 261
Fig. 23. Elevation and Plan ofInsulators Held in Angle-Iron Frames. 218 … 20 ELECTRIC WIRING be protected by porcelain tubes, or, if the conductors be of mbber, bymeans of fibrous tubing placed inside of iron conduits. All conductors on the walls fpr a height of not less than six feetfrom the ground,either should be boxetl in,or,if they be rubber-covered,should…
Architecture · Building · Carpentry
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