Questions and answers on pumps and pumping machinery (1912)
Wakeman, William Henry, 1855- [from old catalog] · Chicago, The Joseph G. Branch publishing company · leaf 35
cury. 91. Q. Describe the principle involved in theoperation of a mercurial barometer. A. Weight of the atmosphere supports the mer-cury, hence the height of it varies with the weight ofair. 92. Q. What causes changes in the weight of theatmosphere? A. Variations in the amount of moisture it… … A. To reduce it to pounds pressure to the squareinch. 95. Q. How? A. By multiplying it by .49, as this fraction of aninch in height of mercury is equal to one pound. PUMPS AND PUMPING MACHINERY. 25 96. Q. Illustrate the process. A. If mercury stands at 30 inches, then 30 X.49 =14.7 pounds to the…
Pumping machinery
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