History of the transformer . as in a certain measure the embryo out ofwhich all dynamos and transformers have have seen how the first induction current wasdiscovered by making and breaking the current froma battery in the, primary coil. This method was at?first adhered to, until Faraday remarked that whenthe secondary was quickly drawn out of or put intoth^ primary coil, induced currents were also pro-duced without requiring to break the circuit, thewires of the secondary coil cutting the lines of forcein the magnetic field of theprimary coil. He then re-placed the primary coil an
History of the transformer . as in a certain measure the embryo out ofwhich all dynamos and transformers have have seen how the first induction current wasdiscovered by making and breaking the current froma battery in the, primary coil. This method was at?first adhered to, until Faraday remarked that whenthe secondary was quickly drawn out of or put intoth^ primary coil, induced currents were also pro-duced without requiring to break the circuit, thewires of the secondary coil cutting the lines of forcein the magnetic field of theprimary coil. He then re-placed the primary coil andbattery by a permanentmagnet, which was likewisedipped into the inductioncoil, Fig. 3. From this, and from thelater development of thisinvention, it follows that thequestion was not of a trans-former in the present senseof the word, but of a second-ary generator. Transformers as at present understood were first known in Europeas the Euhmkorffs induction coil. Before we takeup this invention we shall mention a much earlier. 6 HISTORY OF THE TRANSFORMER. and like invention, which had already been made inthe United States in the year 1838. This was theinduction coil of Professor Page, and was the outcomeof another invention by Professor Henry, whoseapparatus was only a single induction coil. The Henry and first public noticB of Profcssor Pagos apparatus Page, 1836. a^ppg^red in the Silliman-Joumal of 12th May, 1836,under the title, Methods and trials of obtainingphysiological phenomena and sparks from a heatengine by means of Professor Henrys May, 1837, Sturgeon published, in the Annalsof Electricity, in London, a description of theapparatus of Henry and Page. Caiian, 1837. Oallan, an English student of physics in Minnoth,showed first, in the year 1837, that if high tensionwas wanted, it was necessary to employ thick wirefor the primary and thin for the secondary this time wires indeed of different lengths,but of equal cross sections, had always been em-p
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