History of the transformer . 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. tion for the production of these induction were wound round a
History of the transformer . 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. tion for the production of these induction were wound round an iron ring two separatewires of about the same length. The one coil wasbrought into connection with ^ a battery, and to the B 2 4 HISTORY OF THE TEANSPOHMEE, ends of the other a pair of electrodes were current from the battery being sent through theprimary coil, lines of force were produced which ranalmost altogether in the iron core. As the corepossessed only a very small magnetic resistance, theintensity of magnetisation was very great, and onclosing the primary circuit a strong inductive effect onthe secondary coil was produced. Faraday obtainedwith this apparatus the first sparks of induction. Theapparatus is all the more interesting as, althoughnot completely without poles, it at least forms aclosed magnetic circuit. It has much likeness tothe non-polar transformer of Zipernowsky, Deri, andBlathy, but it may be easily shown to be not entirelypoleless. Poles mean, in electrical as well as ma
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