Histoire du transformateur . 37, que si une tensionwas a voulu, il a été nécessaire d'employer l'wirefor épais et mince pour la bobine secondaire.Avant cette date en effet des fils de longueurs différentes, mais de l'égalité, a toujours été em-tion. Son appareil n'était pas si mal comme thosebefore connue, mais tenait toujours loin derrière ce ofProfessor Page. Page, 1838. L'arrangement des pages Professeur, ce qui n'est montré en Fig. 4, était la suivante :-Twocoils de fil bien isolé d'un anotherwere sur blessure à un ensemble de fils de fer. Un self-acting contact casseur a été mis dans le primar

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History of the transformer . 37, that if high tensionwas wanted, it was necessary to employ thick wirefor the primary and thin for the secondary coil.Before this time wires indeed of different lengths, but of equal cross sections, had always been em-ployed. His apparatus was not so bad as thosebefore known, but still stood far behind that ofProfessor Page. Page, 1838. The arrangement of Professor Pages apparatus, which is shown in Fig. 4, was as follows:—Twocoils of wire well insulated from one anotherwere wound on to a bundle of iron wires. A self-acting contact-breaker was put into the primarycircuit, and consisted of a double lever E, having onone of its arms two parts bent downwards, so as todip into two mercury cups. The movement of thepart H, as compared with that of E, was so small mSTOKT OF THE TEANSFOBMEB. 7 that it remained always in the mercury. At M, however, when the lever was set in motion contactwas broken and made. To prevent oxidation Pagepoured in a layer of alcohol over the quicksilver. Fig. 4.. The continuation of the lever in the other direc-tion of the axis, which was borne by two pillars K, was bent backwards, and on its end carried a cylin-drical piece of iron standing before the end of thebundle of iron wires. If the primary coil werenow placed in connection with a source of current, the iron core became magnetised, attracted the cylin-drical piece of iron to itself, and by raising the leverE broke the contact at M. The iron core then lostits magnetism, released the iron armature, and the 8 HISTOBT OP THE TEANSFOKMER. play began anew. A counter-weight F, which couldbe shifted along another lever 0, allowed the play ofthe contact-breaker to be regulated. It will befound that this interruptor was very like that con-structed many years afterwards by Leon Foucault.The effects which Page produced by means of thisinstrument were much more intense than those pro-duced by Euhmkorff with his, as Page succeededwith only a single Grove element in inducin

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