...of wheel-work, which it capable of van-ing its direction and its velocity without any limit. W heels are sometimes turned by simple contact with each other;...passing over them ; and in these cases the minute protuberance of the surfaces, or whatever else may be the cause of friction, prevents their sliding...

...employment of wheel-work, which is capable of varying its direction and its velocity without any limit. Wheels are sometimes turned by simple contact with...chains, passing over them; and in these cases the minute protuberance of the surfaces, or whatever else rosy be the cause of friction, prevents their sliding...

...employment of wheel-work, which is capable of varying its direction and its velocity without any limit. Wheels are sometimes turned by simple contact with...cords, straps, or chains, passing over them ; and in thex cases the minute protuberance of tt surfaces, or whatever else may be toe cause of friction, prevents...

...employment of wheelwork, which is capable of varying its direction and its velocity without any limit. Wheels are sometimes turned by simple contact with...protuberances of the surfaces, or whatever else may bo the cause of friction, prevents their sliding on each other. Where a broad strap runs on a wheel,...

...is capable of varying its direction and velocity without any limit. Wheels are made to act sometimes by simple contact with each other; sometimes by the...intervention of cords, straps, or chains passing over them. Wheels are denominated, spur, crown, or bevel, according to the direction or position of the teeth....