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Illustrating the asymmetry of the fringes and of the illumination-curves in oblique diffraction by a reflecting surface consisting of two parts (Figs. I to IV) or three parts (Figs. V and VI) in the same plane.

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Vol. 35.

FEBRUARY 1918.

No. 206.

Published the First Day of every Month.-Price 2s. 6d.

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Being a Continuation of Tilloch's Philosophical Magazine,'
Nicholson's 'Journal,' and Thomson's 'Annals of Philosophy.'

CONDUCTED BY

SIR OLIVER JOSEPH LODGE, D.Sc., LL.D., F.R.S. SIR JOSEPH JOHN THOMSON, O.M., M.A., Sc.D., F.R.S. JOHN JOLY, M.A., D.Sc., F.R.S., F.G.S. GEORGE CAREY FOSTER, B.A., LL.D., F.R.S.

AND

WILLIAM FRANCIS, F.L.S.

SIXTH SERIES.

N° 206.-FEBRUARY 1918.

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THE

LONDON, EDINBURGH, AND DUBLIN

PHILOSOPHICAL MAGAZINE

AND

JOURNAL OF SCIENCE.

[SIXTH SERIES.]

FEBRUARY 1918.

XVI. Continued Discussion of the Astronomical and Gravitational Bearings of the Electrical Theory of Matter. By Sir OLIVER LODGE *.

PART I.

put

Y short summary in the December number of the Phil. Mag., page 519, put prominently forward the idea that the expected effect required that the additional inertia due to motion should be independent of gravitative influence; for the conclusion seemed obvious that if weight and mass varied together there would be no change in acceleration, and that in that case it did not matter how much the mass of a revolving body varied. But I soon perceived that this was only attending to the transverse acceleration and neglecting the longitudinal, which is taken into account in Professor Eddington's completer theory in the October number of the Phil. Mag., page 322. He there re-determines the fundamental equation of particle dynamics, with momentum a function of speed, and shows that not the ratio F/m, but the product Fm, enters into the absolute term of F/mo m

d2u d02

that equation, so that it becomes +u=

h2 u2 mo

I take up the thread again here, and point out that that being so, the unexpected result follows, that if the additional inertia is acted on by gravity, in accordance with the ordinary

* Communicated by the Author.

Phil. Mag. S. 6. Vol. 35. No. 206. Feb. 1918.

M

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