Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 188
.CATIT- BOA?SD ,e.oor … 150 BUILDING SUPEKINTENDENCfc: Ul The recess is often packed with some non-conducting material.Outside metal comluctors are made of tin, zinc, oalvanized iron,or copper, the latter being tlie most desiral)le and also most ex-pensive. ]\Ietal conductors should be made in some form whichwill permit…
Architecture · Building
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