The Electrical Review, Volume 9Electrical review, Limited, 1881 |
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action apparatus armature arrangement battery bell cable carbon cell cent circuit coil communication from abroad conductors connected construction copper cylinder Dated Debentures diameter diaphragm disc distance Ditto dividend dynamo dynamo-electric machines earth Eastern Edison effect electric current electric lamps electric light electrical conductors electro-magnet electrodes electromotive force employed engine Exhibition experiments fixed galvanometer glass Gramme machine heat horse-power Improvements incandescent increase induction instrument insulated invention lamp-black latter lever Limited magnet magnetised means mechanical ment Messrs metal millimetres motion obtained ohms ordinary Paris passing patent placed plate platinum polarisation poles position produced Professor purpose railway received relay repayable resistance rotation screw selenium shown by fig shows side Siemens signals sounds spring station Submarine surface switch T. A. Edison tele Telegraph Company TELEGRAPHIC JOURNAL telephone temperature terminal tion torsion transmitted tricity tube vibrations wheel whilst wire zinc
Popular passages
Page 296 - Committees for the several Sections before the beginning of the Meeting. It has therefore become necessary, in order to give an opportunity to the Committees of doing justice to the several communications, that each Author should prepare an Abstract...
Page 6 - telegraph ' shall, in addition to the meaning assigned to it in the Telegraph Act, 1863, mean and include any apparatus for transmitting messages or other communications by means of electric signals.
Page 189 - Although the experiments so far made can only be considered as preliminary to others of a more refined nature, I think we are warranted in concluding that the nature of the rays that produce sonorous effects in different substances depends upon the nature of the substances that are exposed to the beam, and that the sounds are in every case due to those rays of the spectrum that are absorbed by the body.
Page 188 - The meaning we have uniformly attached to the words " photophone" and " light" will be obvious from the following passage, quoted from my Boston paper : "Although effects are produced as above shown by forms of radiant energy, which are invisible, we have named the apparatus for the production and reproduction of sound in this way the ' photophone' because an ordinary beam of light contains the rays which are operative.
Page 277 - Bell discovered a new art — that of transmitting speech by electricity — and has a right to hold the broadest claim for it which can be permitted in any case, not to the abstract right of sending sounds by telegraph, without any regard to means, but to all means and processes which he has both invented and claimed. The invention is nothing less than the transfer to a wire of electrical vibrations like those which a sound has produced in the air.
Page 346 - ... 1. Heat radiated from the sun (sunlight being included in this term) is the principal source of mechanical effect available to man.* From it is derived the whole mechanical effect obtained by means of animals working, water-wheels worked by rivers, steam-engines...
Page 182 - ... pressure of the hand is removed. I imagine that in some such manner as this a wave of condensation is started in the atmosphere each time a beam of sunlight falls upon lamp-black, and a wave of rarefaction is originated when the light is cut off. We can thus understand how it is that a substance like lamp-black produces intense, sonorous vibrations in the surrounding air, while at the same time it communicates a very feeble vibration to the diaphragm or solid bed upon which it rests.
Page 332 - (in the only place where it can be brought, viz.) " in any of Her Majesty's courts of justice in England." By Section 59, " A patentee may complain of any infringement of his patent to the commissioners.
Page 186 - Mr. Tainter was convinced from these experiments that this field of research promised valuable results, and he at once devised an apparatus for studying the effects, which he described to me upon my return from Europe. The apparatus has since been constructed, and I take great pleasure in showing it to you to-day.
Page 180 - Such a marked reinforcement of the sound resulted that he was induced to try lampblack alone. About a teaspoonful of lampblack was placed in a testtube and exposed to an intermittent beam of sunlight. The sound produced was much louder than any heard before. Upon smoking a piece of plate-glass, and holding it in the intermittent beam with the lampblack surface towards the sun, the sound produced was loud enough to be heard, with attention, in any part of the room. With the lampblack surface turned...