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Titre : Philosophical transactions of the Royal society of London : giving some accompt of the present undertakings, studies, and labours of the ingenious in many considerable parts of the world. VOL114 (1824)
Auteur : Royal society (GB). Auteur du texte
Éditeur : Royal societyRoyal society (London)
Date d'édition : 1665-1886
Notice d'ensemble : http://catalogue.bnf.fr/ark:/12148/cb37571969b
Type : monographie imprimée
Langue : anglais
Format : Microfiches ; 105*148 mm
Description : Collection numérique : Nutrisco, bibliothèque numérique du Havre
Droits : conditions spécifiques d'utilisation - Microformes et reprints
Droits : restricted use
Identifiant : ark:/12148/bpt6k559193
Source : Bibliothèque nationale de France
Conservation numérique : Bibliothèque nationale de France
Date de mise en ligne : 10/03/2009
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refute this distinction, will require experiments which it is easy to imagine/but which have not yet had an opportunity ot'making. At first sight, indeecl, the phsenomena in question présent a considérable analogy to the electro-magnetic vortices observed in the fluid metals; but on presenting very powerful magnets to the mercury, while under the circumstances above described, in various positions, t hâve never been able to perceive any influence exerted by them in accelerating, retarding, or deviating the currents and moreover, these are incomparably more forcible in proportion to the electric powers used, than the motions produced by the action of magnets.
14. In consequence of this superioF energy of action, the phamomena which form the subject of this Paper, furnish a test, perhaps, the most sensible yet known of the developement of feeble Voltaic powers. 1 constructed a small battery of zinc and copper wires twisted together, each pair being two inches long from the point of junction, and the wires -– of an inch thick. Ten pairs of thèse, excited by extremely dilute nitric acid, caused a rapid rotation in mercury, interposed under sulphuric acid between thé poles, and a regular advance of phaenomena. The sluggish electricity of a single pair of plates may be compared to air, rendered dense and less elastic by excessive cold, while the active charge of a powerful battery, or the spark of an ordinary electrical machine, is in this view assimilated to air with ail its énergies exalted, and its density diminished by violent heat. The same quantity In weight may pass through the same conducting pipe in the same time but in the one case the motion of each molecule will be comparatively much slower, and the actual quantity present at any instant of the discharge (f. g. an inch in length) of thé conductor, much greater than in the other, I am well aware that this is merely an analogical représentation of facts, and of course inaccurate, but it serves to explain the distinction in the text.