. Electricity simplified. The practice and theory of electricity ... s, and as these lines indicate the exerciseof force, they are termed lines of force, the firstelectrostatic lines, the others electromagnetic lines. There is no good analogy by which these phenom-ena can be pictured. Sometimes attempts in this di-rection are made by picturing the ether as composedof intermeshing cog-wheels. By using this concep-tion, various states of stress can be figured, but theexamples do not seem very practical. The action of lines of force between excited disksor other objects is shown in the following
. Electricity simplified. The practice and theory of electricity ... s, and as these lines indicate the exerciseof force, they are termed lines of force, the firstelectrostatic lines, the others electromagnetic lines. There is no good analogy by which these phenom-ena can be pictured. Sometimes attempts in this di-rection are made by picturing the ether as composedof intermeshing cog-wheels. By using this concep-tion, various states of stress can be figured, but theexamples do not seem very practical. The action of lines of force between excited disksor other objects is shown in the following illustra-tions. When objects electrically excited with oppo- ELECTROSTATIC LINES OF FORCE. 31 site electrical conditions are brought near together,the lines of force run almost straight from one to theother of the facing areas, while other lines curve Fig. 1.—Electrostatic Lines op Force Between Near Surfaces. around from the backs and sides of the objects. Asthey are more separated, the lines curve outward, al-ways tending to separate from each other, until the. Fig. 2.—Electrostatic Lines of Force Between Distant Surfaces. conception of what occurs is what is illustrated inthe second cut. The expression lines of force must be regardedas purely a matter of convenience. There are no 32 ELECTRICITY SIMPLIFIED. real lines any more than there are individual and dis-tinct rays of light. This attraction of electrified bodies has been no-ticed for many centuries. The first observed electri-cal experiment on record is the attraction of rubbedamber for pieces of chaff. Unsatisfactory as these statements appear in thelight of explanation, they are as satisfactory as anyexplanation of gravitation that can be evolved. Butwe are so familiar with gravitation that we do notstop to think about it, or to assign a cause for it. The Leyden Jar. The Leyden jar is a form of condenser. It is anapparatus for storing up a charge, or actually twoequal and opposed charges of electricity. To provide
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Keywords: ., bookcentury1800, bookdecade1890, bookidel, booksubjectelectricity
