412
OHM ON THE GALVANIC CIRCUIT.
and
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then according to the law just ascertained
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a fourth proportional to , and
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a fourth proportional to , and
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a fourth proportional to , and .
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Draw the line through parallel to , regard this line as the axis of the abscissæ, and erect at any given points , , the ordinates , , , we obtain their respective values, thus:
In the first place we have, since
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whence follows:
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or if we substitute for its value
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If now represent a line such that
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then
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Secondly, since and are equal to the lines drawn through and to parallel to
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whence
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or, since
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If now for and we substitute their values and , we obtain
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and if by we represent a line such that