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MANAGERS AND PROJECTIONISTS
sure as between positive (+) and negative ( — ). It is measured in volts.
HOW WORK IS PERFORMED.— Steam under pressure generated by confining it in a boiler, seeks to lower its pressure by expanding in volume. We allow it to enter the cylinder of a steam engine in which is a movable piston. On one side of the piston is the pressure of the steam, and on the other only the pressure of the air, which for our purpose represents zero. In seeking to expand its volume, and thus reduce its pressure, the steam will shove the piston ahead of it to the end of the cylinder, pulling with it the load attached to it, thus generating power.
In doing this the steam itself is not consumed. It still exists, having been discharged into the open air, but its pressure has been consumed. Steam is merely the medium, the compression of which stores up power. It acts precisely as does a coil spring. Compress the spring and you will have storedup power, which will be available until the spring has again expanded to its former state, whereupon, while the spring itself remains, the power has all been expended and is gone.
We cannot see electricity. The light we see in a lamp is not electricity itself, but a product of its power. We cannot weigh it. Apparently it has no weight. We cannot feel it, except in the form of a "shock," which again is not electricity itself but a product of its power. We do, however, find its action to be almost precisely the same as that of steam or water under pressure, so that we may readily use these as a basis for comparison.
Apparently, as already set forth, electricity exists under pressure on one wire, the positive, and apparently it loses its pressure in the act of entering the negative wire — the act of becoming negative — hence, since pressure is power and pressure is consumed in passing from positive to negative, it follows that power is generated when current passes from positive to negative and this power is made available for use by means of what amounts to an electric engine, one side (pole) of which is connected to positive and the other to negative. The particular power generating device may be a lamp, by means of which light is produced, a motor by means of which pulling power is made available, or it may be a heating coil. In either case electricity is made to do a useful thing, hence its power is turned into useful channels.
THE EARTH AND THE POWER SOURCE.— There is a mistaken idea entertained by many, that electricity seeks to