ClipArt ETC
A wheel that communicates motion; the wheel of a locomotive, which, adhering to the track, communicates the power of the steam-engine to the vehicle.

Driving-wheel

A wheel that communicates motion; the wheel of a locomotive, which, adhering to the track, communicates…

"Singer sewing-machine. a is the frame and cloth-plate or bed-plate; b, arm; ... g, small driving-wheel attached to shaft h; i, take-up cam with set-screw; j, take-up lever with roller and stud; ... m, spool-pin; n, shuttle-pitman taking motion from crank o; p, shuttle bell-crank; q, shuttle-carrier and shuttle; r, thread-guide; s, tension-disk ..." -Whitney, 1911

Singer Sewing Machine

"Singer sewing-machine. a is the frame and cloth-plate or bed-plate; b, arm; ... g, small driving-wheel…