Scientific Papers: 1881-1887University Press, 1900 |
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Common terms and phrases
adjustment ampère angle aperture apparatus apparent magnitude appear approximately arrangement axis B.A. unit battery brightness calculation cells centim circuit Clark Clark cell coefficient coil colour comparison copper correction corresponding Daniell cell determined diameter difference direction disk distance e-By effect electrical electromotive force equal equation error experiments fluid fork galvanometer given glass inches increase induction iron Leclanché cell length light Lord Rayleigh magnetic force magnetometer mean radius mercurous sulphate mercury method millimetre millims mirror motion mutual induction nearly necessary needle number of turns observations obtained ohms optical Phil plane plate position prism proportional quantity ratio rays reflection refraction resistance rotation scale self-induction silver solution spectrum speed standard suppose surface suspended telescope temperature thickness tion tube velocity vibration viscosity wave-length wire zero zinc zinc sulphate
Popular passages
Page 332 - I doubt not will be again extended, not merely to myself but to all the English members of the Association. I am confident that those who have made up their minds to cross the ocean will not repent their decision, and that, apart altogether from scientific interests, great advantage may be expected from this visit. We Englishmen ought to know more than we do of matters relating to the colonies, and anything which tends to bring the various parts of the empire into closer contact can hardly be overvalued....
Page 340 - ... be raised indefinitely, it is impossible to utilize all the energy which, according to the first law of thermo-dynamics, is resident in the coal. On a sounder view of the matter, the efficiency of the steam-engine is found to be so high that there is no great margin remaining for improvement. The higher initial temperature possible in the gas-engine opens out much wider possibilities; and many good judges look forward to a time when the steam-engine will have to give way to its younger rival.
Page 149 - But even when its temperature does not exceed that of boiling water, the wire produces a dark ascending current. This, I say, is due to the distribution of the floating matter. Imagine the wire clasped by the mote-filled air. My idea is that it heats the air and lightens it, without in the same degree lightening the floating matter. The tendency, therefore, is to start a Current of clean air through the mote-filled air. Figure the motion of the air all round the wire. Looking at its transverse section,...
Page 342 - We may, I believe, expect from Professor Stokes a further elucidation of the processes involved. In the meantime, it is obvious that the results already obtained are of the utmost value, and fully justify the action of the Institution in devoting a part of its resources to experimental work.
Page 99 - Those who wish to repeat these experiments would do well to bear in mind, as an essential condition of complete success, that a free way should be open for the transmission of the vibrations from the flame, backwards, through the gas-pipe which feeds it. The orifices of the stopcocks near the flame ought to be as wide as possible.
Page 337 - ... Germany, and H. Becquerel in France, have detected the rotation in gases and vapours, where, on account of its extreme smallness, it had previously escaped notice. Again, the question of the magnetic saturation of iron has now an importance entirely beyond what it possessed at the time of Joule's early observations. Then it required special arrangements purposely contrived to bring it into prominence. Now in every dynamo machine, the iron of the field-magnets approaches a state of saturation,...
Page 333 - I doubt whether we adequately realise the enormous obligations under which we lie. It is no exaggeration to say that the life of such a man as Siemens is spent in the public service; the advantages which he reaps for himself being as nothing in comparison with those which he confers upon the community at large. As an example of this it will be sufficient to mention one of the most valuable achievements of his active...
Page 336 - Light," which Tyndall likens to the Weisshorn among mountains, as high, beautiful, and alone. This judgment (in which I fully concur) relates to the scientific aspect of the discovery, for to the eye of sense nothing could have been more insignificant. It is even possible that it might have eluded altogether the penetration of Faraday, had he not been provided with a special quality of very heavy glass. At the present day these effects may be produced upon a scale that would have delighted their...
Page 335 - As regards space, life on board ship is highly concentrated, while unity of management and the presence on the spot of skilled engineers obviate some of the difficulties that are met with under other circumstances. At present we have no experience of a house-to-house system of illumination on a great scale and in competition with cheap gas ; but preparations are already far advanced for trial on an adequate scale in London.
Page 339 - ... of the first law is partly responsible for the little attention that is given to the second, for the second law- so far contradicts the usual statement of the first as to assert that equivalents of heat and work are not of equal value. While work can always be converted into heat, heat can only be converted into work under certain limitations. For every practical purpose, the work is worth the most; and, when we speak of equivalents, we use the word in the same sort of special sense as that in...