Instructions for Testing Telegraph Lines And the Technical ..., volume 2
Instructions for Testing Telegraph Lines And the Technical ..., volume 2
Louis Schwendler
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Ann.^ vol cii. p. 66), Dr. Wr. Siemens gaye the general laws of charge and discharge as found by experiments. It is interesting to mention that Ohm, so long ago as 1820, predicted the phenomenon of charge and discharge, since, when investigating mathe- matically the propagation of electricity in linear condactors, he not only introduced in the differential equation the lateral loss by leakage (conduction of air), but also used a certain co-efficient, which repre- sented that peculiarity of elec...tricity, that different points of the linear conductor may require different quantities of electricity to raise their potential to a given amount This co- efficient is nothing else than what later on was called the Inductive Capacity of the point in ques- tion (see Appendix I, vol. i. p. 41). In fact, all problems, a solution of which may be required for telegraph lines, follow directly from Ohm's general ^nation ; it is only necessary to introduce the newly- defined quantities. Sir W. Thomson has applied Ohm's equation in his paper " On the Theory of the Electric Telegraph," Phil.
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