Questions and answers on pumps and pumping machinery (1912)
Wakeman, William Henry, 1855- [from old catalog] · Chicago, The Joseph G. Branch publishing company · leaf 55
an be easily moved from place toplace on the narrow-gauge tracks over which coal ormetals are brought out of mines. See Fig. 23. 175. Q. How are they driven ? A. Formerly they were driven by steam or com-pressed air. The latter assisted in ventilating themines. Since electric motors have come into… … PUMPS AND PUMPING MACHINERY. 45
Pumping machinery
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