The Electrical Review, Band 6

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Electrical review, Limited, 1878
 

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Seite 115 - Undulations are caused in a continuous voltaic current by the vibration or motion of bodies capable of inductive action, or by the vibration of the conducting wire itself in the neighborhood of such bodies. Electrical undulations may also be caused by alternately increasing and diminishing the resistance of the circuit, or by alternately increasing and diminishing the power of the battery.
Seite 68 - WE Weber were elected Honorary Members of the Society. After votes of thanks had been passed to the Lords of the Committee of Council on Education for the use of the physical lecture room at South Kensington, as...
Seite 365 - ... art was contemporaneous with the first great development of mathematical science. In an earlier part of this discourse I have alluded to the importance of mathematical precision recognised in the technique of art during the Cinquecento ; and I have now time only to add that on looking still further back it would seem that sculpture and painting, architecture and music, nay even poetry itself, received a new, if not their first true, impulse at the period when geometric form appeared fresh chiselled...
Seite 68 - Society is to be devoted annually to the formation of a library, and an exchange of publications is already made with various learned societies abroad. Special stress was laid on the distinctive object held in view at the formation of the Society, namely the exhibition, when practicable, of the experiments referred to in papers read at the meetings. — The following officers and council were elected for the ensuing year : — President, Prof.
Seite 395 - When the electrodes are in contact, the current circulating through m renders it magnetic and attracts the armature a, thus separating the electrodes, when, on the weakening of the current, the elasticity of the rod b again restores the contact During the movement of the negative electrode, since it is caused to occur many times...
Seite 324 - If we could lay down beforehand precise limits of possible knowledge, the problem of Physical Science would be already half solved. But the question to which the scientific explorer has often to address himself is not merely whether he is able to solve this or that problem, but whether he can so far unravel the tangled threads of the matter with which he has to deal as to weave them into a definite problem at all.
Seite 326 - constructors of the 18th century in the domestic arts ; and remind you that not only the engineer and the architect, but even the cabinetmakers, devoted half the space of their books to perspective and to the principles whereby solid figures may be delineated on paper, or what is now termed descriptive geometry. Nor perhaps would the sciences which concern themselves with reasoning and speech, nor the kindred art of Music, nor even Literature itself, if thoroughly probed, offer fewer points of dependence...
Seite 326 - The microphone affords another instance of the unexpected value of minute variations — in this case of electric currents ; and it is remarkable that the gist of the instrument seems to lie in obtaining and perfecting that which electricians have hitherto most scrupulously avoided, viz., loose contact. Once more, Mr. De la Rue has brought forward, as one of the results derived from his stupendous battery of 10,000 cells, strong evidence for supposing that a voltaic discharge, even when apparently...
Seite 325 - The pioneer and the advanced guard are of necessity separated from the main body, and in this respect mathematics does not materially differ from its neighbours. And, therefore, as the solitariness of mathematics has been a frequent theme of discourse, it may be not altogether unprofitable to dwell for a short time upon the other side of the question, and to inquire whether there be not points of contact in method or in subjectmatter between mathematics and the outer world which have been frequently...
Seite 366 - ... and definite utterances than an uncertain sound ; in proportion as knowledge is better than surmise, proof than opinion ; in that proportion will the mathematician value a discrimination between the certain and the uncertain, and a just estimate of the issues which depend upon one motive power or the other. While on the one hand he accords to his neighbours full liberty to regard the unknown in whatever way they are led by the noblest powers that they possess ; so on the other he claims an equal...

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