Where, as in the case of the crank and pitman, a rectilinear motion and circular motion are coupled, there may be a loss in the application of the power to useful work, always consequent upon the ...

This occurs at the hip and shoulder, returning the arms and legs back to their original position from a jumping jack movement. Rotation – this is where the limb moves in a circular movement ...

On more and more devices, from our wrist watches to the time shown on our cell phones and bottoms our computer screens, time ...