Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 208
is placed at the supply end of eachradiator, designed to admit any desired volume of steam. A little trap or water-seal fitting isconnected with the return end of eachradiator, a small hole being providedabove the water line to permit the escapeof air. All returns are joined in thebasement and…
Architecture · Building · Carpentry
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