. The London, Edinburgh and Dublin philosophical magazine and journal of science. nce of B= 14*5 ohms. E in ohms. S in ohms. Kick on taking outBattery Key. 0 167 Eight- 10 31-5 Eight. 20 50 Eight. 30 75 Eight. 40 109 Eight. 50 157 Eight. 60 233 Eight. 70 371 Eight, but small. 80 697 Lett. 72 414 Eight, one division. 73 434 No kick. 74 465 Left, one division. X the coefficient of self-induction of B is therel to ore equa. 4342L * (434+109-3)2 N * Very careful measurements by Mr. VV. G. Griffith of the self-inductances of these coils, in which Lord Kayleichs method was used,gaie; for A, Q2
. The London, Edinburgh and Dublin philosophical magazine and journal of science. nce of B= 14*5 ohms. E in ohms. S in ohms. Kick on taking outBattery Key. 0 167 Eight- 10 31-5 Eight. 20 50 Eight. 30 75 Eight. 40 109 Eight. 50 157 Eight. 60 233 Eight. 70 371 Eight, but small. 80 697 Lett. 72 414 Eight, one division. 73 434 No kick. 74 465 Left, one division. X the coefficient of self-induction of B is therel to ore equa. 4342L * (434+109-3)2 N * Very careful measurements by Mr. VV. G. Griffith of the self-inductances of these coils, in which Lord Kayleichs method was used,gaie; for A, Q236 henry, and, forB, 0-151 henry. 6J0 On the Comparison of Two Self-Inductions. When the kick is large it is not necessary to have anaccurate balance for permanent currents; a rough balancewill suffice. But when the transient currents are nearlyzero, the permanent balance must be as good as possible. In the above experiment an ordinary mirror galvanometerof the Thomson type was used. The following is, perhaps, the easiest way of applying theprinciple of the method :— Kir. The self-inductions, L and N, of the coils whose resistancesare R and S are to be compared. Rx and Si are non-inductiveresistances equal, respectively, to R and S. There is thus abalance for steady currents. The Qs are equal non-inductiveshunts which are varied till there is no transient current. LQS JN must not be greater We have ., LS than -_-ix and Si. thenN=KPTQ)- ThuOtherwise, the shunts must be applied to S University College, GaTway,March 13, 1911. [ 611 ] LXIX. Notes on the Electrification of the Air near the ZambesiFalls. By W. A. Douglas Rudge, , Professor ofPhysics, University College, Bloemfontein *. THE electrification of the atmosphere is always verymarked near a waterfall, and it seemed of sufficientinterest to take a series of observations in the neighbourhoodof what is probably the largest fall in the world. It ishardly necessary to describe the structure of the fall, but itmay be no
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