ect current may be con- conditions. In general, however, it is advisable to use a double-acting pump, sidered essential for locomotive haulage, and is perfectly satisfactory if the other either a duplex or triplex. To raise uses of electric power are not numerous. a certain amount of water against… … ing, and in its solution the electric motor is extensively used. It must be ad- mitted that there is little advantage in A PORTABLE ROCK DRILL, OPERATED BY the electrical operation of very large ELECTRIC HAMMER BLOWS pumps, unless, as is often the case, two or three double-acting cylinders their…
Engineering
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