PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON VOL. IV.

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Page 71 - That gravity should be innate, inherent, and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of anything else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity that I believe no man who has in philosophical matters a competent faculty of thinking can ever fall into it.
Page 314 - ... 1331). I shall, in the following, consider some of the applications of this conception of the inductometer as a dividing of electrostatic induction. Method for Determining Inductive Capacity. The methods for determining electrical resistance which are based upon division of the current may be transferred to the measurement of inductive capacity. In...
Page 200 - ... all the remaining machines, depending on the varying diameters of the parts of a rolling system. As this subject has been treated so recently by Mr. Merrifield in his " Report on the Present State of Knowledge of the Application of Quadratures and Interpolation to Actual Data...
Page 11 - THE recent discovery by Mr. Hall of a new action of magnetism on electric currents opens a wide field for the mathematician, seeing that we must now regard most of the equations which we have hitherto used in electromagnetism as only approximate, and as applying only to some ideal substance which may or may not exist in nature, but which certainly does not include the ordinary metals. But as the effect is very small, probably it will always be treated as a correction to the ordinary equations.
Page 213 - I *' (25) which reduces, if we neglect powers of - above the first, to E/R'C'-RO L By altering R the sign of this maj- be made to change, and thus the initial current may be in the same or in the opposite direction to the final. In practice this is indicated by a short kick of the needle in one direction, followed by a deflection in the other. On the same assumptions as to p, p', let us find the quantity of electricity which passes through the galvanometer in time T, T being very short, but yet so...
Page 228 - As two notes of equal amplitudes separate from unison, they are at first received by the ear in the manner of resultant displacements, consisting of the beats of a note whose frequency is midway between that of the primaries. When the interval reaches about two commas, the ear begins to resolve the resultant displacements, and the primary notes step in beside the beats. When the interval reaches a minor third in the ordinary parts of the scale, neither the beats nor the intermediate pitch of the...
Page 195 - Soc. vol. xxii. p. 366, and vol. xxiii. p. 209. been proved by experiments on a considerable scale for determining the density of fluid cast iron. The following is the principle on which this instrument acts. If a spherical ball of any metal be plunged below the surface of a molten bath of the same or another metal, the cold ball will displace...
Page 286 - ... branches of the ice-line will converge very considerably for temperatures above 0 and with negative pressures. At this rate of convergence the meeting-point is at about 14 C. At higher temperature the ice would pass gradually into water — that is, we should here have another critical point, — the two critical points being at opposite ends of the closed curve which represents the water-ice line. On considering the isothermals below 0, it will be noticed that the waterisothermals, at...
Page 91 - It is also to be remarked, that the permanent working electromotive force of a galvanic element consisting of zinc and a less oxidizable metal immersed in sulphuric acid can never exceed the number 2,056,200, derived from the full thermal equivalent for a single cell of Smee's, since the chemical action is identical in all such cases, and the mechanical value of the external effects can never exceed that of the chemical action. In a pair consisting of zinc and tin, the electromotive force has been...

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