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8 RICHARDSON'S BLUEBOOK OF PROJECTION
sure it seeks to expand its volume and thus lower its pressure. We permit it to enter a cylinder in which is a movable piston on one side of which is steam pressure and on the other side only the pressure of air. The steam (pressure) shoves the piston along to the end of the cylinder, thus expanding its volume, and lowering its pressure. If a load is attached to the piston the load will be moved and power will be produced.
(10) In this action the steam itself is not consumed. The same quantity remains but its pressure has been consumed or reduced, the power produced representing reduction in pressure. Steam is merely the medium through which pressure works. (11) Compression of steam stores up power. This is very similar in action to the compression of a coil spring. Compress the spring and power is stored up therein, which may be made available by releasing the spring and permitting it to expand again. The spring remains but the power is gone. (12) It is much the same with electricity. It is under pressure (voltage), the release of which produces power. When current flows through a lamp or motor, its voltage is reduced, not the current. Exactly the same quantity or volume of electric current that enters the device through one wire leaves it on the other.
(13) Electricity is invisible. Light produced by it is not electricity but merely the evidence of its power. However, we do find its action to be essentially the same as that of water or steam under pressure, hence those two very tangible, understandable things may well be used as a basis of comparison.
(14) Apparently, electricity exists under pressure on one wire of a circuit. Apparently it looses its tension or pressure in the act of entering the other wire. Or perhaps it might be better to say pressure is lost as the two forces, negative and positive, amalgamate or join.
(15) Be that as it may, certainly pressure is lost and vve are able to turn pressure reduction into power production by the use of certain devices such as lamps, motors, heating coils, etc. We permit the positive and negative to join in the act of passing through these devices, and