Electricity for public schools and colleges . been given of quite a different form of this method is of great interest, we shall describe at somelength one form of machine that is constructed on this principle;the machine, viz., that is called the Gramme^ after the name ofits inventor. His armature, however, is not quite original in con-struction, being similar to an earlier form, invented in 1862 byProf Pacinotti. § 8. The * Gramme. Construction of Armature.—In fig. erive a general view of a hand-model of the Gramme we can see the ring-shaped armature turning bet
Electricity for public schools and colleges . been given of quite a different form of this method is of great interest, we shall describe at somelength one form of machine that is constructed on this principle;the machine, viz., that is called the Gramme^ after the name ofits inventor. His armature, however, is not quite original in con-struction, being similar to an earlier form, invented in 1862 byProf Pacinotti. § 8. The * Gramme. Construction of Armature.—In fig. erive a general view of a hand-model of the Gramme we can see the ring-shaped armature turning between thepole-pieces a and b of the steel magnet A ; the arrangements forgiving a rapid rotation to this armature ; and the collecting springsor brushes c and i, in contact with the axle on opposite sides of it,bymeans of which a current is sent through the external circuit. CH. XXIII. DYNAMO-ELECTRIC MACHINES 3S9 Fig. ii. shows us the construction of this armature. There is-a circular core composed of soft iron wires ; these are shown in. Fig. i. section. From the way in whichthe armature rotates these wiresdo not cut the Unes of force ;and thus induced eddy-currents,a cause of waste of energy, donot occur as would be the casewere the core solid. Round this core is woundthe insulated copper wire thatforms the coil in which are induced. This wire—it must be carefully noted—/jtcontimious; and herein we havea great difference between this kind of armature and that ofClark or Siemens. In the upper part of fig. ii. we see this wire
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Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
