. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . hen not in use. Underneath this table is fixed a balanced treadle and driving wheel,similar to those of a sewing machine. The cord from the driving wheel passes through thetable and around a small pulley, to actuate the governing device, which is arrangefl to givespeed of 1(50 revolutions per minute. In practice this speed can be maintained withinone or two revolutions, no mat-ter how fast or how irregularlythe trea
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . hen not in use. Underneath this table is fixed a balanced treadle and driving wheel,similar to those of a sewing machine. The cord from the driving wheel passes through thetable and around a small pulley, to actuate the governing device, which is arrangefl to givespeed of 1(50 revolutions per minute. In practice this speed can be maintained withinone or two revolutions, no mat-ter how fast or how irregularlythe treadle is worked. From apulley, on the other end of thegovernor, a cord passes to themain pulley of the instrument,which is fixed to the front of thetable. This pulley is loose on aspindle which carries the cen-tring drum that supports one endof the record cylinder. A simi-lar drum, opposite the former,and at a distance from it corre-sponding to the length of thecylinder, nins free in a suitalilebearing. This drum and its cyl-inder are capable of a lateralmotion, controlled by a mount a cylinder upon itscentres, the drum and its spindleare drawn back, the cylinder is. Fig. 1.—Tlie phonograph.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
