## Electric waves: being researches on the propagation of electric action with finite velocity through space |

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according action active spark antinodes apparatus appear assume axis bodies centimetres components constant copper wire deduced denote diameter dielectric difference direction disappear discharge dz dy effect electric force electric oscillations electric waves electrical disturbances electromagnetic force electromagnetic induction electromotive force electrostatic force end of book energy equal equations ether experiments finite further Helmholtz Hence Herr induction induction-coil insulated interference isotropic knobs latter length Leyden jars lines of force magnetic force magnitude Maxwell's equations Maxwell's theory metallic metres micrometer millimetres mirror motion neighbourhood nodes non-conductors number of lines observed obtained passive spark period of oscillation perpendicular phenomena phenomenon plane plate polarisation ponderomotive forces position primary conductor primary oscillation produced quantities reflection regard resonance rotation secondary circuit secondary conductor self-induction side space spark-gap spark-length sparking distance tion transversal waves true electricity tube variation velocity vertical wall wave-length waves in wires zero