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>Observations on the reciprocal influence which magnetic needles exercise over each other, when placed at a given distance within their respective spheres of action, at different positions on the earth; with tables of numerical results obtained at separate stations. Also a method of discovering where certain local influences are acting on the needle, from which may be obtained a proportional correction to be applied to magnetic observations in general
【2h】
Observations on the reciprocal influence which magnetic needles exercise over each other, when placed at a given distance within their respective spheres of action, at different positions on the earth; with tables of numerical results obtained at separate stations. Also a method of discovering where certain local influences are acting on the needle, from which may be obtained a proportional correction to be applied to magnetic observations in general