Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 183
he pressure rises to acertain point, it raises thelever slightly and opens avalve which admits waterinider pressure above a dia-phragm located near thesmoke-pipe. This actionforces down a lover con-nected by chains with the Fig. 123. Showing interior DetaiT^ Return Trap damper, and closeS it. of… … 144 HEATING AND YEXTILATIOX 135 case a piston is operated by the water-pressure, instead of a diaphra_^m.In both types the pressures at which the damper shall open and closeare regulated by suitable adjustments of the weights upon the levers.Pipe Connections. The method of making the pipe…
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