The middle of three wheels, which simply conveys the motion of one outside wheel to the other outside wheel.
Suppose A, B, C to be three wheels, B being the idle or gear wheel. B simply conveys the motion of A to C, or of C to A.
The middle of three wheels, which simply conveys the motion of one outside wheel to the other outside wheel.
Suppose A, B, C to be three wheels, B being the idle or gear wheel. B simply conveys the motion of A to C, or of C to A.