Philosophical Transactions of the Royal Society of London, Band 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 apparatus Auckland Island backwards batten body brain branches branchiæ breeze Calm carbonic acid cells chamber circuit circulatory system clouds and wind Crustacea cubic inch decomposing distributed dorsal effect electricity electro-motive force Elliptic Erebus excited experiments fibres Fine-It galvanometer ganglia ganglion gas battery gases Geophilus h m ft h m h m heart High Water Hobarton hydrogen Inclination insects Island Iulus Kerguelen Island liquid Low Water magnetic MDCCCXLIII Mean metal muscles Myriapoda needle nervous cord Observatory oesophagus organ Overcast-light wind oxygen P.M. Fine-light clouds pass Plate platinum Polydesmida portion positive posterior rain Remarks resistance rheomotor rheostat Royal Medals S.E. by E SA.M Scolopendra segment ship's attraction ship's head side solution starlight steam steam-globe structure surface systemic arteries Terror throughout the day Tide trunk tube vessels vestibular sac vibration voltaic wind throughout wire
Beliebte Passagen
Seite 105 - ... 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.
Seite 23 - ... 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...
Seite 107 - 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...
Seite 28 - ... that surface where the film is believed to exist, and such a globule, though almost entirely water, may well act as an oil globule, and by its friction render the wood, &c. positive, itself becoming negative. 2126. That water which is rendered ineffective by a little saline or acid matter should still be able to show the effect of the film of oil (2121.) attached to it, is perfectly consistent with this view. So also is the still more striking fact that alkalized water (2092.) having no power...
Seite 308 - ... these names have been applied, though perhaps the terms Magnetic, Chemical, Calorific, &c. Rheometer would be more appropriate. This may be the proper place to explain a few other terms which I have frequent occasion to use, though not in the course of the present communication. By Rheotome is meant an instrument which periodically interrupts a current, and by Rheotrope an instrument which alternately inverts it. A Rheoscope is an instrument for ascertaining merely the existence of an electric...
Seite 315 - To save time and trouble in this operation will be of great importance to the future progress of electrochemistry, on account of the great number of experiments of this kind which yet remain to be made, and also from the fluctuations in the electromotive forces of many circuits from chemical and other actions, which render observations requiring considerable time to make completely valueless.
Seite 20 - On letting in distilled water, abundance of electricity was evolved ; on putting a small crystal of sulphate of soda, or of common salt into the water, the evolution ceased entirely. Re-employing distilled water, the electricity appeared again ; on using the common water supplied to London, it was unable to produce it. 2091. Again, using the steam-globe (2076.), and a box-wood tube (2102.) which excites well if the water distilling over from the boiler be allowed to pass with the steam, when I put...
Seite 316 - The relations of the lengths of the added 1 • a, + rn si -\- nr resistances r and nr, which are known immediately, give therefore those of the electro-motive forces. Experimentally I proceed thus : — I interpose the rheostat and the galvanometer in the circuit, and then add, by means of the former, assisted if necessary by the resistance coils, a sufficient resistance to bring the needle exactly...
Seite 320 - T 2 § 12. The resistance or reduced length of a rheomotor may be ascertained by either of the following processes : — First Method. — Place the galvanometer and the rheostat in the circuit, and adjust the latter until the needle of the galvanometer stands at a determined point. Then divide the current which passes through the wire of the galvanometer, by placing an equal resistance by its side ; the needle will recede. The reduced length, measured by the number of turns of the rheostat, required...