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acid amber ampere apparatus appears armature arranged attacked attracted Bell body cable carbon caused chemical circuit coil conductor connected contrivance copper current passes cylinder devised diaphragm direction discharge discovery disk distance dynamo earth earth batteries effect elec electric current electric light electric machine electrified electro-magnet electro-motive force electrotype energy experiments fact feet flow galvanic battery galvanic cell galvanometer glass globe heat hundred hydrogen incandescent lamps inch induction induction coil instrument insulated invention inventors iron latter lever Leyden-jar lines of force liquid locomotive magneto electric means mechanical metal miles Morse motion motor moving needle operation oxygen permanent magnet piece placed plate platinum poles produced Professor receiving reed Reis represented in Fig resistance ring rotated rubbed selenium sent signals simply sound spark speech station steam surface tele telegraph telephone tion torpedo transmitted tricity tube vessel vibrations voltaic pile wheel wire zinc
Page 22 - Doubts and despair had begun to prevail, when the fact was ascertained, in so clear a manner, that even the most incredulous could no longer withhold their assent. Repeated sparks were drawn from the key, a phial was charged, a shock given, and all the experiments made which are usually performed with electricity.
Page 275 - 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 swifter 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.
Page 21 - ... enabled to complete his grand and unparalleled discovery by experiment. The plan which he had originally proposed was, to erect, on some high tower or other elevated place, a sentry-box, from which should rise a pointed iron rod, insulated by being fixed in a cake of resin. Electrified clouds passing over this would, he conceived, impart...
Page 19 - Chagrined a little that we have hitherto been able to produce nothing in this way of use to mankind, and the hot weather coming on, when electrical experiments are not so agreeable, it is proposed to put an end to them for this season somewhat humorously, in a party of pleasure on the banks of the Schuylkill.
Page 263 - This gliding fire, with central wire The fine degrees distinctly showing. Swing, magnet! swing! advancing and receding; Swing, magnet! answer, dearest, what's your final reading? o love! you fail to read the scale Correct to tenths of a division; To mirror heaven those eyes were given, And not for methods of precision.
Page 213 - But be this as it may, the fact that the magnetic action of a current from a trough is at least not sensibly diminished by passing through a long wire, is directly applicable to Mr. Barlow's project of forming an electromagnetic telegraph ; * and it is also of material consequence in the construction of the galvanic coil.
Page 274 - And as glasses have highly promoted our seeing, so 'tis not improbable, but that there may be found many mechanical inventors to improve our other senses, of hearing, smelling, tasting, touching. '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.
Page 21 - He prepared one by fastening two cross sticks to a silk handkerchief, which would not suffer so much from the rain as paper. To the upright stick was affixed an iron point. The string was, as usual, of hemp, except the lower end, which was silk. Where the hempen string terminated, a key was fastened. With this apparatus, on the appearance of a thunder-gust approaching, he went out into the commons, accompanied by his son...
Page 256 - I sat in the electrician's room, a flush of light came up from the deep, which, having crossed to Ireland, came back to me in mid-ocean, telling that those so dear to me, whom I had left on the banks of the Hudson, were well and following us with their wishes and their prayers. This was like a whisper of God from the sea, bidding me keep heart and hope.
Page 297 - His fifth and final claim is of "the method of and apparatus for transmitting vocal or other sounds telegraphically, as herein described, by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sounds, substantially as set forth.