Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 131. Water-Seal Motor. form a passageway through which the air is continually withdrawn bythe vacuum pump or other draining apparatus. The action outlined continues as long as water is present. No adjustment whatever is necessary; the motor is entirely auto-matic. One special advantage claimed for this system is that the amountof steam admitted to the radiators may be regulated to suit the require-ments of outside temperature; and is possible without watc- 153 ]\\ HEATING AND VENTILATION. 154

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