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XXIII.—On the Geometrical Mean Distance of Two Figures on a Plane
Published online by Cambridge University Press: 17 January 2013
Extract
There are several problems of great practical importance in electro-magnetic measurements, in which the value of a quantity has to be calculated by taking the sum of the logarithms of the distances of a system of parallel wires from a given point. The calculation is in some respects analogous to that in which we find the potential at a point due to a given system of equal particles, by adding the reciprocals of the distances of the particles from the given point. There is this difference, however, that whereas the reciprocal of a line is completely defined when we know the unit of length, the logarithm of a line has no meaning till we know not only the unit of length, but the modulus of the system logarithms.
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- Research Article
- Information
- Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 26 , Issue 4 , 1872 , pp. 729 - 733
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- Copyright © Royal Society of Edinburgh 1872
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