Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 102
CnUC WIRING 69 Ilu priiuipal f:i<tor.s to Ik. Coii.si(Kn«l in overhciul liucwork willlit- hriftlv oiitliiud. Ilacing of Poles. As a f^fiuTal ruli, tlu* jM»lrs slioulil l>e svl fnjinllM) to 12.) fttt apart, which is e<juivaltnt t«> r>.i to 42 jkjWs jkt mile.riuliTctTtaiii… … r
Architecture · Building
Internet Archive · Kelly Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
