Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . FiG. 140,—Six Cells Connected FOR Intensity. (After De Watteville.) s, zinc elements ; c,carbon or platinum This arrangement is known as in series or compoundcircuit. it increases the electro-motive force of the battery. motive force and the internal resistance will be increased twenty should thus have the following formula:— 1X20 2 C: .048+. 20X20+10 41 Finally, if the cells were arranged in four groups of
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . FiG. 140,—Six Cells Connected FOR Intensity. (After De Watteville.) s, zinc elements ; c,carbon or platinum This arrangement is known as in series or compoundcircuit. it increases the electro-motive force of the battery. motive force and the internal resistance will be increased twenty should thus have the following formula:— 1X20 2 C: .048+. 20X20+10 41 Finally, if the cells were arranged in four groups of five each insimple circuit, we should have practically four cells with elements fivetimes as large ; hence, the internal resistance would be only one-fifth that. Fig. 141.—Six Cells Connected for Quantity, , in surface, or in simple circuit.(After De Watteville.) 2, zinc elements: c, carbon or platinum elements. This arrange-ment does not affect the electro-motive force of the battery. of a single cell and the electro-motive force four times as great,should then have the following formula:— 1X4 4 2 C = = —= - 7 We .285+. 25+10 14 Remember that the electro-motive force means the difference inpotential of the cell elements. It is therefore unchanged by their cup of water elevated one hundred feet will produce as much press-ure through a pipe connected with it (provided that the cup be kept 622 LECTURES ON NERVOUS DISEASES. constantly filled) as would a lake ten miles in circumference, at the sameelevation and similarly connected with tlie pipe. So it is with electro-motive force. The size of the elements will alter the quantity of elec-tricity generated ; but the electro-motive force of a cell or battery willremain undisturbed b
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