. Annals of Philosophy. 300 Analyses of Books. [Oct. 130. Accordins; to the hypothesis above adverted to, it is almost impossible to sec beforehand wlietlier any given situatinii of the i)all will produce an easterly or westerly deviation, and more particularly lo form any idea of the quantity, as to greater or less. In all the early part of mv experiments, I had this dirticulty to encounter; and it was only after some reflection ihat I was enabled to arrange the results in a manner which presented a certain degree of order : this order was ren- dered, however, tolerably perspicuous after 1 ha
. Annals of Philosophy. 300 Analyses of Books. [Oct. 130. Accordins; to the hypothesis above adverted to, it is almost impossible to sec beforehand wlietlier any given situatinii of the i)all will produce an easterly or westerly deviation, and more particularly lo form any idea of the quantity, as to greater or less. In all the early part of mv experiments, I had this dirticulty to encounter; and it was only after some reflection ihat I was enabled to arrange the results in a manner which presented a certain degree of order : this order was ren- dered, however, tolerably perspicuous after 1 had determined the existence of the plane of no 131. I had already arrived at this conclusion when I mentioned the results of mv experiments to my colleague, S. 11. Christie, lisq. who became much interested in the inquiry, and afterwards spent willi me some time in the pursuit; and to him I owe the following simple idea of the mode of action, which, wliether it be actually correct or not, will serve (as Dr. Young has remarked, with reference to the theory of Coulomb), as a convenient vehicle of illustration, and for uniting under one gene- ral head a number of facts which would be otlii'iw i?e detached and iiisi\lated. On examining the nature of the several resultsobtained in ijjy first series of experi- ments, adverted to in Sect. I. (he above-named i;enileman observed, that holh the qua- lity and quantity of the several deviations were (as nearly as could le tlien asc er- tained) such as would liavc had place, supposing the needle to have been inclined in its natural direction, and then referred to llie horizontal plane: in fact, that ?whatever might he the posilion of the ball, the result still seemed to have a certain relation with the quality and quantity of the dcviaiion which would take place on a line passing through the centre of the needle, and having an inclination corres- ponding to that of the dip. This line, for the pur|)ose of fixing the ideas, we may
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