. The London, Edinburgh and Dublin philosophical magazine and journal of science . Fig. 3. which answers very well. The arm B is a resistanceon which two sliders move,one of them being connectedto each armature of the con-denser K. Obtain a permanent ba-lance ; then AC = BD. Now adjust sliders untilthere is also a balance is closed x be the current flowingin the arms A and D whenit has attained its permanentvalue, and let y be that inthe arms B and C. Let rbe the resistance between the sliders when both balances areobtained. Let the battery and galvanometer circuit
. The London, Edinburgh and Dublin philosophical magazine and journal of science . Fig. 3. which answers very well. The arm B is a resistanceon which two sliders move,one of them being connectedto each armature of the con-denser K. Obtain a permanent ba-lance ; then AC = BD. Now adjust sliders untilthere is also a balance is closed x be the current flowingin the arms A and D whenit has attained its permanentvalue, and let y be that inthe arms B and C. Let rbe the resistance between the sliders when both balances areobtained. Let the battery and galvanometer circuits be bothclosed, and let the former be broken. The quantity of elec-tricity which passes through the galvanometer due to the. 56 Mr. E. C. Kimington on a Method of self-induction in D La A + B ~ G(A + B)*G+A + B C+D+G+A+B -, since AC = BD. B(C + D) + G(B + C)J The quantity which passes through the galvanometer, due tothe discharge of the condenser, K r C + D A + B+G(0 + D) Xg + C + D G+C + D Kyr2C B(C + D) + G(B + C) since AC = BD. Now these quantities obviously pass through the galvano-meter in opposite directions ; and if there is no throw, theymust be equal. Therefore L^B Kyr2C B(C-t-D) + G(B + C)~ B(C + D) + G(B + C) X B Now y T> T Tr 2D If r=B, we have Maxwells method, and L = KBD. Of course it is not necessary to use two sliders; onearmature of the condenser can be connected either to thejunction of A and B or to the junction of B and C, and theothe** to the slider; but by having B composed of two slide-resistances, the smaller one being equal to the resistance ofone of the coils of the larger, and employing a slider on each,a much greater range of adjustment can be obtained. Suppose r to be slightl
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