Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 87
basin and alsoin filling the outlet, which iscontracted somewhat, in orderthat the flow of water may fillit completely and produce on alarge scale the vacuum as pre-viously described in relation to the S-trap, so that the pressure ofthe air upon the water in the basin helps to push out the… … Fig. 47. Hopper and Trap. 65 58 BUILDING SUPERINTENDENCE
Architecture · Building
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