Questions and answers on pumps and pumping machinery (1912)
Wakeman, William Henry, 1855- [from old catalog] · Chicago, The Joseph G. Branch publishing company · leaf 58
a special reason for calling it a vacuum pump ? A. None, except common practice. Every pumpfor general service must create a vacuum in the suctionpipe, in order to raise water or other liquids, hence PUMPS AND PUMPING MACHINERY. 47 the term vacuum applies to all, except a very smallclass that are… … 179. Q. What are the advantages of a doublevacuum pump, as illustrated in Fig. 25 ? A. It gives large capacity for comparatively smallfloor space, and a steady vacuum is maintained onaccount of the continuous effect of the pumps. 180. Q. What is a force pump? A. Any pump that forces water against…
Pumping machinery
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