Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 323
Philadelphia, Pa. 263 ELECTRIC WIRING 60 Tlie principal factors to be considered in overheatl linework willbe briefly ontlined. Placing of Poles. As a general rule, the poles should be set from100 to 125 feet apart, which is equivalent to 53 to 42 poles per mile.Under certain conditions,… … Fig. 60. Plan View. Cover, andSection of Double CutOut Box.
Architecture · Building · Carpentry
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