Proceedings of the Physical Society, 3–4 tomaiInstitute of Physics and the Physical Society., 1880 |
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Kiti leidimai - Peržiūrėti viską
Proceedings of the Physical Society, 1–2 tomai Institute of Physics and the Physical Society Visos knygos peržiūra - 1876 |
Proceedings of the Physical Society, 18–19 tomai Institute of Physics and the Physical Society Visos knygos peržiūra - 1904 |
Proceedings of the Physical Society, 18 tomas Institute of Physics and the Physical Society Visos knygos peržiūra - 1902 |
Pagrindiniai terminai ir frazės
acid action alloys amount angle apparatus axis battery beats C. V. Boys calculated calorimeter cell cent centimetre centims centre circuit coefficient coils condenser conductivity constant copper crystal curve Daniell cell deflexion determined diameter direction disk distance earth ebonite effect elec electric electrodes electrolysis electromotive force equal equation experimental experiments formula galvanometer gases given glass gramme-degrees grammes Hence hydrogen inches increase induction induction-balance inductive effect instrument iron Joule light liquid magnetic means measured mercury metal method microwebers millimetres millims motion negative observed obtained ohms ordinary oxygen paper passing photophone plane plate platinum polarization pole position potential pressure prism produced Prof quantity rays resistance rotation secondary coil selenium Society specific heat spectrum sulphuric acid surface telephone temperature theory thickness tion torsion tourmaline tube variation velocity vertical vibration volt voltameter wire zinc
Populiarios ištraukos
3 psl. - Colonies, and he was nominated a Knight Commander of the Order of St. Michael and St. George in 1869.
6 psl. - Air : for that that is not the only medium I can assure the Reader, that I have, by the help of a distended wire, propagated the sound to a very considerable distance in an instant, or with as seemingly quick a motion as that of light, at least incomparably quicker than that which at the same time was propagated through the Air ; and this not only in a straight line, or direct, but in one bended in many angles.
308 psl. - ... and other insulating dielectrics (1228); and we can apparently go so far in the analogy, whilst limiting the case to the inductive action only, as to show that amongst insulating dielectrics some lead away the lines of force from others (1229.), as the wire will do from worse conductors, though in it the principal effect is no doubt due to the ready discharge between the particles whilst in a low state of tension. The retardation is for the time insulation; and it seems to me we may just as fairly...
84 psl. - ... than the required amount, we should find that the sounds increase when the key is depressed ; but when the coil is moved to a degree where there is absolute equality, if key is up or down, then the degree on scale should give the true value of the disturbance produced in the induction balance ; and this is so exact that if we put, say a silver coin whose value is 115°, no other degree will produce equality. Once knowing, therefore, the value of any metal or alloy, it is not necessary to know...
79 psl. - Volta's fundamental experiment proving contact electricity by electroscopic phenomena resulting from change of distance between parallel plates of zinc and copper, I found a null method for measuring electromotive forces due to metallic contact between dissimilar metals, in terms of the electromotive force of a Daniell's cell, which is represented diagrammatically in Fig. 7, and in perspective in Fig. 8 [omitted].
82 psl. - In order to have a perfect induction-currents balance suitable for physical research, all its coils as well as the size and amount of wire should be equal. The primary and secondary coils should be separate and not superposed. The exterior diameter of the coils presented this evening is 5-^ centims., having an interior vacant circular space of 3£ centims.
85 psl. - ... 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 found by Poggendorff to be only about half that of a pair consisting of zinc and copper, and consequently less than half that of a single cell of Smee's.
82 psl. - I have sometimes used a magnetic pendulum, the swing or the arc described indicating and measuring the forces. ° I am at present engaged upon a very sensitive voltameter which shall indicate and measure the force of rapid induced currents. The telephone, however, is well adapted as an indicator, but not as a measurer of the forces brought into action. For this reason...
6 psl. - Tis not impossible to hear a whisper a furlong's distance, it having been already done ; and perhaps the nature of the thing would not make it more impossible, though that furlong should be ten times multiplied.
85 psl. - A miligramme of copper on a fine iron wire, finer than the human hair, can be loudly heard and appreciated by direct measurement, and its exact value ascertained. We can thus weigh to an almost infinitesimal degree the mass of the metal under examination ; for instance, if we take two English shilling pieces fresh from the Mint, and if they are absolutely identical in form, weight, and material, they will be completely balanced by placing one each in the two separate coils, provided that for these...