Philosophical Transactions of the Royal Society of London, Volum 125W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1835 |
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Philosophical Transactions of the Royal Society of London, Volum 125 Royal Society (Great Britain) Visualització completa - 1835 |
Philosophical Transactions of the Royal Society of London, Volum 108 Royal Society (Great Britain) Visualització completa - 1818 |
Philosophical Transactions of the Royal Society of London, Volum 103 Royal Society (Great Britain) Visualització completa - 1813 |
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Passatges populars
Pàgina 321 - Totum una leuga longitudine et dimidium leugae latitudine '— being 1440, 360, and 720 acres respectively, and so on. If an examination is made of these entries it is impossible to arrive at any other conclusion than that the...
Pàgina 254 - Contributions towards a System of Geological Chronology founded on an examination of fossil remains, and their attendant phenomena...
Pàgina 45 - ... effects of these two communications, make and break contact between the platina terminations and the mercury of the cup G or E (1079.), When the short wire is used, the platina will be ignited by the constant current, because of the quantity of electricity, but the spark on breaking contact will be hardly visible ; on using the longer communicating wire, which by obstructing will diminish the current, the platina will remain cold whilst the current passes, but give a bright spark at the moment...
Pàgina 56 - The spark on making contact, for the reasons before given, was very small (1101. 1107.); that on breaking contact, very excellent and brilliant. The continuous discharge did not seem altered in character, whether a short wire or the powerful electro-magnet were used as a connecting discharger. 1117. The effects produced at the commencement and end of a current, (which are separated by an interval of time when that current is supplied from a voltaic apparatus,) must occur at the same moment when a...
Pàgina 56 - Saxton's beautiful arrangement,) an important influence of these principles of action is evidently shown. From the construction of the apparatus the current is permitted to move in a complete metallic circuit of great length during the first instants of its formation: it gradually rises in strength, and is then suddenly stopped by the breaking of the metallic circuit; and thus great intensity is given by induction to the electricity, which at that moment passes (1064.
Pàgina 2 - In all this, however, we are guided much more by fancy than by reason ; for, in order to depress or elevate the absolute level of the sea, by a given quantity, in any one place, we must depress or elevate it by the same quantity over the whole surface of the earth ; whereas no such necessity exists with respect to the elevation or depression of the land.
Pàgina 194 - ... a picture, to which the bow formed a resplendent frame. My attendants were incredulous that the figures they saw under such extraordinary circumstances could be their own shadows, and they tossed their arms and legs about, and put their bodies into various postures, to be assured of the fact by the corresponding movements of the objects within the circle ; and it was some little time ere the superstitious feeling with which the spectacle was viewed wore off. From our proximity to the fog, I believe...
Pàgina 264 - ... coppers does take place, provided there be no other channel open by which the forces may circulate; but when such a channel is permitted, the return or back discharge of which I speak is exceedingly diminished, in accordance with the principles laid down in the Eighth Series of these Researches. 1123. Guided by these principles I was led to the construction of a voltaic trough, in which the coppers, passing round both surfaces of the zincs, as in Wollaston's construction, should not be separated...
Pàgina 49 - With the helix only (1061.), these effects could scarcely be observed, in consequence of the smaller inductive force of this arrangement, the opposed action from induction in the galvanometer wire itself, the mechanical condition and tension of the needle from the effect of blocking (1087.) whilst the current due to continuance of contact was passing round it ; and because of other causes. With the extended wire (1064.) all these circumstances had still greater influence, and therefore allowed less...
Pàgina 56 - If the conduction of electricity be effected by vibrations (283), or by any other mode in which opposite forces are successively and rapidly excited and neutralized, then we might expect a peculiar and contrary development of force at the commencement and termination of the periods during which the conducting action should last (somewhat in analogy with the colours produced at the outside of an imperfectly developed solar spectrum) : and the intermediate actions, although not sensible in the same...