. American telephone practice . LAMINATED ARMATURE. up in this manner, the core is properly insulated with cloth saturatedwith shellac, after which the winding is put on. The most common method of transmitting the motion of thecrank to the armature shaft is by means of a large gear-wheel onthe crank shaft, meshing with a pinion on the armature shaft, theratio of speed in rotation between the two shafts being about as 120 AMERICAN TELEPHONE PRACTICE. one to five. The Holtzer-Cabot Company introduced, and onceused to a large extent, a chain-drive, by means of which a chain,having links of steel
. American telephone practice . LAMINATED ARMATURE. up in this manner, the core is properly insulated with cloth saturatedwith shellac, after which the winding is put on. The most common method of transmitting the motion of thecrank to the armature shaft is by means of a large gear-wheel onthe crank shaft, meshing with a pinion on the armature shaft, theratio of speed in rotation between the two shafts being about as 120 AMERICAN TELEPHONE PRACTICE. one to five. The Holtzer-Cabot Company introduced, and onceused to a large extent, a chain-drive, by means of which a chain,having links of steel wire passed over two sprockets, as shown inFig. 91, in practically the same manner as in the ordinary chain-driven bicycle. This afforded a very smooth-running, quiet drive,. FIG. 91.—CHAIN-DRIVEN MAGNETO GENERATOR. but this has been almost entirely superseded by the direct meshingspur gears, a detail of which is shown in Fig. 92. In this, both thelarge gear and pinion are of brass, having wide faces cut to securesmooth running. In order to prevent the jerk occasioned by the
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