. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM SANITATION 521 lighting, the electric current may be used for other purposes- small motors, electric irons, etc. The Electric Plant. It does not seem practical to install an electric plant large enough to furnish power to the various machines used on the farm. Not only would the cost of in- stallation be very great, but such a plant when used for light- ing would be very inefficient. An electric lighti
. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM SANITATION 521 lighting, the electric current may be used for other purposes- small motors, electric irons, etc. The Electric Plant. It does not seem practical to install an electric plant large enough to furnish power to the various machines used on the farm. Not only would the cost of in- stallation be very great, but such a plant when used for light- ing would be very inefficient. An electric lighting plant consists primarily of a source of power or a motor of some sort, a generator or dynamo to furnish the current, the wiring, the lights, and, under all normal conditions, a storage battery to supply cur- rent when the motor and gen- erator are not running. The Source of Power. Water- power makes an ideal power for the plant, as it is almost always very cheap. It is, however, not often available; hence the princi- pal source of power for the farm electric plant is the gasoline or kerosene engine. These, as has been shown, have developed to the point where they are quite reliable, and the power is furnished in small units at a very reasonable cost. Furthermore, the gasoline engine requires the minimum of attention while running, which is an essential feature of the entire private electric plant. Definitions. In discussing an electric plant, recourse must be made to some electrical terms. Electric current has two properties :'(1) The pressure or the voltage, which is the measure of the tendency on the part of an electric current to flow; and (2) the amount of current flowing, or the amperage. Thus a 110-volt lamp requires 110 volts of pressure or voltage to make its filament glow brightly. If the lamp be a 16- candle-power carbon filament lamp only one-half ampere will. Fig. carbon filament electric lamp; B is the new tungsten lamp, which is much more Please not
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