. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. t upon the continuity of onecircuit. This advantage necessitates a greater expenditure of motive power to produce the samelight power. Lontin introduced into England, in 1875, a plan for converting the whole of the electricity pro-duced in the revolving armature of a machine, into the exciting magnets, instead of a had the effect of rendering the exciting magnets very powerful in a short time, and the mag-netic resistance to the rotation of the coil increased in a few minutes to the extent tha
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. t upon the continuity of onecircuit. This advantage necessitates a greater expenditure of motive power to produce the samelight power. Lontin introduced into England, in 1875, a plan for converting the whole of the electricity pro-duced in the revolving armature of a machine, into the exciting magnets, instead of a had the effect of rendering the exciting magnets very powerful in a short time, and the mag-netic resistance to the rotation of the coil increased in a few minutes to the extent that it wasfound difficult to overcome it. The circuit was then broken by an automatic commutator, and tliespecial working circuit inserted. In 1876, Lontin constructed a machine to overcome the difficultyof the heat generated in the coils of the former machine. This latter consisted of an armature inthe form of a wheel, with a central boss and s^Dokes of soft iron, mounted on a shaft to whichrotary motion could be imparted, Fig 1059. Each soft-iron spoke of the wheel has a coil of wire. wound on it, and is, in fact, an electro-magnet, which becomes a source of induced electricity whenthe wheel is revolved between the poles of a fixed electro-magnet. The residual magnetism of thecores of the electro-magnets is sufficient at first to generate a feeble current in the coils when tliewheel is revolved; and a portion of this current, kept in one direction by a commutator, is divertedin the usual manner into the fixed electro-magnets, to inten&ifv them. One or several of these induction wheels may be applied on the same shaft, placing themopposite one or more series of permanent or electro-magnets. ^Vhen two wheels are fixed on thesame shaft, one of them can supply currents exclusively for feeding the electro-magnets, and thecurrents from the other can be used for external work. If the currents are required to be of onlyone direction, a commutator or collector is employed, and one for e
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
