Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 193
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 form a passageway through which the air is continually withdrawn bythe vacuum pump or other draining apparatus.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. Xo adjustment whatever is necessary; the motor is entirely auto-matic. One special advantage claimed… … o a o a. M fe 154
Architecture · Building · Carpentry
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