Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 224
so on through the series. If thewater must be pumped to a great height,and pumps capable of giving only a smallpressure are to be obtained, some sucharrangement as this is necessary. Now if w^e compare the water pressureat the outlets, p and p\ of the upper andlower tanks, it will also be evident… … t^J-Aau Fig. 107 210 ELECTRICITY [§§ 352-353 the same way, if a great resistance is to be overcome byan electric current, a high pressure is necessary. If voltaiccells are used, as the pressure or electromotive force ofeach is low, some such arrangement must be resorted to,to secure the required…
Physics
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