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accumulators action amperes apparatus armature arrangement Assiout cable calculated carbon cells charge chemical circuit coils condenser conductors connected constant contact-force copper curve Daniell cell David Salomons deposited dielectric difference of potential dynamo dynamo machines electric current electric lighting electricians électriques electro-magnet electro-motive force electrodes electrolyte energy engine equal experiments galvanometer give given grammes heat hydrogen impressed force incandescent increase induction installation instruments insulated iron junction liquid magnet maximum means measured mercury metals method millimetre motor number of lamps observed obtained oxygen paper Paris Peltier effect plates platinum polarisation pole position practical produced pull quantity railway railway signals remarks resistance shunt Siemens signal Society solution standard sulphate surface telegraph temperature theory Thomson tube unit Vide Volta effect voltaic volts Wady Haifa Wheatstone bridge wire zinc and copper zinc sulphate
Page 522 - Donations to the Library were announced as having been received since the last meeting from Mr.
Page 410 - LAMPS. We have first to decide how we shall take account of the variation in the number of lamps alight due to the time of the day, the day of the week, and the period of the year.
Page 190 - I should also consider true if the prefix " im " be made to the fourth word. 10. Pellat then proceeds to explain why he considers the Peltier effect to be quite distinct from, and have no relation to, the true EMF of contact. In explaining this he makes use of a piece of unpleasantly plausible reasoning, which I myself have heard Professor Ayrton use, and which, when unexpectedly suggested, is so painfully benumbing that it is worth while to quote it, and to indicate its weak point.
Page 373 - I know, that the lamps were of an inferior quality, and this seems to be borne out by the fact that the whole lot were afterwards removed and replaced by others.
Page 189 - EMF's only one can be measured by a legitimate process, that namely from copper to zinc. If we cause an electric current to pass from copper to zinc, the heat generated in the conductor per unit of electricity is a measure of the work done by the current, for no chemical or other change is effected. Part of this heat arises from the work done in overcoming ordinary resistance within the copper and the zinc. This part may be diminished indefinitely by letting the electricity pass very slowly. The...
Page 189 - Volta's electromotive force must be sought for, not at the junction of the two metals, but at one or both of the surfaces which separate the metals from the air or other medium which forms the third element of the circuit.
Page 208 - ... and to suggest its cause. This has been done by many others ; but I may be permitted to repeat my own notion, vague and incomplete though it avowedly is. Molecules of matter do not move in independence of electricity ; at any rate the converse is certainly true — electricity does not move independently of matter. Electricity, in flowing through a wire, meets with resistance ; there is something analogous to friction between the matter and the electricity, and the opposing force is precisely...
Page 304 - or " cation," and " ions." Take, for example, the definition given by Sprague* of " anode " : " The positive electrode or pole of a battery ; the wire or plate connected to the copper or other negative element of the battery ; the plate which leads the + current into a solution to be decomposed, and at which are set free the oxygen, acid radicals and all — ions (anions). In electro-metallurgy it is usually formed of the metal to be deposited, in which case it is called the soluble anode or pole...
Page 207 - EMF of contact between metal and medium, rather than between metal and metal, it remains to consider whether this belief requires one to assert that there is no true contact-force at all at the junction of two metals. By no means — the existence of such a force is undoubted; but for metals it is usually very small, and may be neglected in comparison with the Volta force, though, strictly speaking, what is observed electroscopically is a mixture of the two.