On a General Bridge Method for Comparing the Mutual Inductance Between Two Coils with the Self Inductance of One of Them
Charles Herbert Lees · Proceedings of the Physical Society of London · 1915
It is shown that the self-inductance L of a coil of resistance S may be compared with the mutual inductance M between the coil and another by making the first coil one arm of a bridge, PQRS, of which the second coil and a resistance U + V in series form one diagonal, the galvanometer forming the other. The cell is connected through a key to the point of contact of U and V. When the steady balance has been obtained U or V can be varied so as to get an induction balance for any value of L / M without P, Q, R or S having to be changed. Then L / M = - {Q + S + (1 + Q / P) V} /(T + U).