Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 181
the mains must be long, the wet return system affords the opportunity to rise and drip the supply main as often as necessary; whereas, with the diy return system, the main and return havea gradual pitch from startto finish. This oftenbrings the return so low asto interfere with head room.\Yith the… … Fig. 20. Wet Return Srstem.
Architecture · Building · Carpentry
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
