Philosophical Transactions of the Royal Society of London, Volume 133W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1843 |
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00 A.M. Direct A.M. Direct A.M. to Direct action antennæ Auckland Island backwards body brain branches branchiæ breeze Calm carbonic acid cells chamber circuit circulatory system clouds & wind clouds and wind Cloudy-light wind Crustacea cubic inch distributed dorsal EDWARD BELCHER effect electro-motive force Elliptic Erebus excited experiments fibres Fine-It galvanometer ganglia ganglion gas battery gasometers Geophilus High Water Hobarton hydrogen Inclination insects intensity Island Iulus Kerguelen Island liquid Low Water magnetic MDCCCXLIII Mean metal muscles Myriapoda needle nerves nervous cord Observatory oesophagus organ Overcast Overcast-light wind oxygen P.M. Cloudy-light P.M. Fine-light clouds pair pass Plate platinum Polydesmida portion positive posterior rain Remarks resistance respired air rheomotor rheostat Royal Medals Royal Society SA.M Scolopendra segment ship's head side solution starlight steam steam-globe structure surface systemic arteries termination Terror throughout the day Tide trunk tube vessels vestibular sac vibration voltaic wind throughout wire
Popular passages
Page 294 - ... form the extremities of the coils by which they are united to the circuit. On the upper face of each cylinder is a double brass spring moveable round a centre, so that its ends may rest at pleasure either on the ends of the thick connecting wires, or may be removed from them and rest only on the wood.
Page 93 - ... chlorine and oxygen, on the one hand, and hydrogen and carbonic oxide, on the other, are the only gases which were decidedly capable of electro-synthetically combining so as to produce a voltaic current*. I should perhaps except olefiant gas, which appears to give rise to a continuous though extremely feeble current; and the vapours of bromine and iodine, were they less soluble, would probably also be found efficient as electro-negative gases.
Page 11 - ... in the latter case effects occurred which, if not understood, would lead to great confusion. Thus an insulated wire was held in the stream issuing from a glass or metal tube, about half an inch from the mouth of the tube, and was found to be unexcited : on moving it in one direction a little further off, it was rendered positive ; on moving it in the other direction, nearer to the tube, it was negative. This was simply because, when near the tube in the forcible part of the current, it was excited...
Page 95 - Applying the hypothesis of Grotthus to the gas battery, we may suppose that when the circuit is completed, at each point of contact of oxygen, water and platinum, in the oxygen tube, a molecule of hydrogen leaves its associated molecule of oxygen to unite with one of the free gas ; the oxygen thus thrown off unites with the hydrogen of the adjoining molecule of water; and so on until the last molecule of oxygen unites with a molecule of the free hydrogen ; or we may conversely assume that the action...
Page 296 - E r, the expression becomes ^ ; in order that the effect in the second circuit shall be rendered equal to this, it is evident that the added resistance must be multiplied by the same factor as that by which the electro-motive forces and...
Page 13 - Hog's-lard, spermaceti, bees'-wax, castor oil, resin applied dissolved in alcohol; these, with olive-oil, oil of turpentine, and oil of laurel, all rendered the boiler positive, and the issuing steam negative. Of substances which seemed to have the reverse power, it is doubtful if there are any above water. Sulphuret of carbon, naphthaline, sulphur, camphor, and melted caoutchouc, occasionally seemed in strong contrast to the former bodies, making the boiler very negative, but on trying pure water...
Page 100 - I have tried, associated with hydrogen in battery fig. 8. carbonic oxide, olefiant gas, protoxide of nitrogen, and deutoxide of nitrogen; the two former produced no current or chemical effect, the two latter gave a current and were decomposed. The volume of the deutoxide contracted one-half, this was found to be nitrogen, which thenceforth was gradually increased by hydrogen. The volume of the protoxide did not undergo the previous contraction, except slightly from solubility, but its change of state...
Page 291 - On the wood cylinder a spiral groove is cut, and at one of its extremities a brass ring is fixed, to which is attached one of the ends of a long wire of very small diameter, which when coiled round the wood cylinder fills the entire groove, and is fixed at its other end to the remote extremity of the brass cylinder. Two...
Page 9 - ... 2092. Common water in the steam-globe was powerless to excite. A little potash added to distilled water took away all its power; so also did the addition of any of those saline or other substances which give conducting power to water. 2093. The effect is evidently due to the water becoming so good a conductor, that upon its friction against the metal or other body, the electricity evolved can be immediately discharged again, just as if we tried to excite lac or sulphur by flannel which was damp...
Page 295 - ... ascertain this by the above method an auxiliary galvanometer would be required, but when a second galvanometer is not at hand, recourse may be had to the following process. Take two rheomotive elements exactly equal both in electro-motive force and resistance ; place one of them in the circuit fig. 1, and observe accurately the deviation of the needle ; then interpose also the other element and bring the needle again to the same point by means of the rheostat. The equivalent of the wire uncoiled...