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animal apparatus appearance arrangement attraction axis body brass ball cell centre charge chemical action circuit coating coil communication conducting connected copper copper wire cylinder decomposed decomposition dilute direct current direction disc discharge distance earth effect Elec electric current electrified electro-magnet electrolyte electrometer electroscope employed excited experiments extremities Faraday feet fluid force frog galvanic galvanometer heat helix hydrogen increased induction insulated intensity length Leyden Leyden jar light machine magnetic Matteucci mercury metallic motion muscles muscular needle negative nerve nervous nitric acid north pole observed obtained opposite oxide oxygen pairs particles pass phenomena piece pile plate platinum platinum wire polarity prime conductor produced quantity of Electricity revolving screw shock side silver soft iron solution south pole spark substance sulphate sulphuric acid surface takes place tion touch tricity voltaic battery voltaic pile wire zinc
الصفحة 204 - ... the atoms of matter are in some way endowed or associated with electrical powers, to which they owe their most striking qualities, and amongst them their mutual chemical affinity.
الصفحة 423 - !T may be proved," says M. Arago, "that the immortal discovery of the voltaic pile arose in the most immediate and direct manner from a slight cold with which a Bolognese lady was attacked in 1790, for which her physician prescribed the use of frog-broth.
الصفحة 276 - He told them that the direction of the needle was not to the polar star, but to some fixed and invisible point. The variation, therefore, was not caused by any fallacy in the compass, but by the movement of the north star itself, which, like the other heavenly bodies, had its changes and revolutions, and every day described a circle round the pole.
الصفحة 74 - I believe at present that it can. But when what I consider the true effect only was obtained, the quantity of gas given off was so small that I could not ascertain whether it was, as it ought to be, oxygen at one wire and hydrogen at the other. Of the two streams one seemed more copious than the other, and on turning the apparatus round, still the same side in relation to the machine gave the largest stream.
الصفحة 221 - I had often practised, with some degree of success, a method of preventing the oxidation of polished steel, by slightly heating it until it would melt fine bees...
الصفحة 274 - The contact theory assumes, in fact, that a force which is able to overcome powerful resistance, as for instance that of the conductors, good or bad, through which the current passes, and that again of the electrolytic action where bodies are decomposed by it, can arise out of nothing; that, without any change...
الصفحة 34 - For though all the particles in the line of induction resist charge, and are associated in their actions so as to give a sum of resisting force, yet when any one is brought up to the overturning point, all must give way in the case of a spark between ball and ball.