Proceedings of the Physical Society of London, 4 tomasPhysical Society of London, 1881 |
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100 cubic centims action amount apparatus axis battery bulb capillary tube centimetre chemical circuit coefficient coils combination-tone condensed conductivity constant copper corresponding counter E.M.F. set crystal curves Daniell cell determined diameter difference of potential diffusion direction distance ebonite plate effect elec electrodes electrolysis electromotive force electrophorus equal equation experiments film fluid galvanometer gases given glass grammes grammes per 100 greater heat heat of combustion hydrogen increase induction layer Leclanché cells less light liquid magnetic maximum measured mercury metal microwebers millim millimetres mistuned molecules negative nickel observed obtained ohms ordinary ordinary ray oxygen paper photophone plane platinum polarization position pressure produced Prof quantity rays refraction resistance selenium cell Siemens unit specific square centimetre square centims substance sulphuric acid surface temperature theory thickness tion tourmaline vapour-tension vibration volt voltameter volts waves whilst wire zinc
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71 psl. - 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.
314 psl. - ... 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...
200 psl. - ... 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...
11 psl. - 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.
213 psl. - 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...
228 psl. - 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...
195 psl. - 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...
286 psl. - ... 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...
91 psl. - 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...