. The principles of physics. Fig. 460. Fig. 461. over a cylinder or drum, as in Fig. 461. Examples : theEdison, the Weston,- and the Siemens. (3) In pole or radial arTnatures the coils are wound on sep-arate poles that project radially from a cylinder (Fig. 462). In alternating current dynamos, in order to obtain the rapidreversals (in some machines as many as 200 per second) of-currents in opposition to resistance offered by self-induction,a number of poles of alternate polarity are employed. The separate coils may be coupled either in series or inmultiple-arc. When low is desired, as
. The principles of physics. Fig. 460. Fig. 461. over a cylinder or drum, as in Fig. 461. Examples : theEdison, the Weston,- and the Siemens. (3) In pole or radial arTnatures the coils are wound on sep-arate poles that project radially from a cylinder (Fig. 462). In alternating current dynamos, in order to obtain the rapidreversals (in some machines as many as 200 per second) of-currents in opposition to resistance offered by self-induction,a number of poles of alternate polarity are employed. The separate coils may be coupled either in series or inmultiple-arc. When low is desired, as for incan-descent lamps in multiple arc, the separate coils are united * The Thomson-Houston armature cannot be classified, as it is unique amongarmatures. It is spheroidal in shape. REVEBSIBILITY OP THE DYNAMO. 571 in multiple arc; but where great is required, theyare connected in series, as shown in Figs. 462 and 463.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
