History of the transformer . in theyear 1832. Faradays first induction apparatus consisted oftwo coils of wire, the one being slid over the he was passing the current from a battery throughone of these, he made the discovery that each timethe circuit of the coil was opened or closed an B 2 HISTORY OF THE TBANSFOEMEB. electromotive force was created in the second coil,which caused a short gush of current or inductioncurrent to flow, provided the circuit of this coil wasclosed, as might be through a galvanometer. Thepeculiarity of this induced current was, that it onlyflowed in the seco
History of the transformer . in theyear 1832. Faradays first induction apparatus consisted oftwo coils of wire, the one being slid over the he was passing the current from a battery throughone of these, he made the discovery that each timethe circuit of the coil was opened or closed an B 2 HISTORY OF THE TBANSFOEMEB. electromotive force was created in the second coil,which caused a short gush of current or inductioncurrent to flow, provided the circuit of this coil wasclosed, as might be through a galvanometer. Thepeculiarity of this induced current was, that it onlyflowed in the second coil during the time the currentin the first coil took to reach its normal strengthafter closing the circuit, or on breaking the circuitduring the time the current took to decrease fromits normal strength to zero. This discovery undoubtedly belongs to the domainof the transformer, induction being the physicalprecedent upon which the transformer, is based;indeed, a tranformer is in principle an induction apparatus. Fig. Fig. 1 represents the arrangement of this funda-mental experiment. The primary coil is connectedwith the battery, the secondary with the galvano- HISTOBT OF THE TRANSFOEMEE. meter. The primary coil, in order to obtain thebest effect, is placed inside the secondary, and onopening and closing its circuit the needle of thegalvanometer is thrown to the one or the other siderespectiTcly. The arrangement, as in Fig. 2, made by Faradayshowed itself to be an especially effective combina- FiG.
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