The plate is rotated by a centrifugal mechanism, thus advancing the ignition timing (making the spark occur earlier) at higher revolutions.

In operation, the rings stay in one location as the lapping plate rotates beneath them.

Later, in 1920, he proposed that the plates rotate, rather than merely oscillate, around their long diagonals.

GPS measurements indicate that the plate is slowly rotating counter-clockwise.

As the circular plate slowly rotates, the disk cutters slice into the rock, which falls through spaces in the cutting head onto a conveyor system.

The floating pen: A huge circular plate of glass rotating by timed motor.

As a result, the plate would rotate a bit.

By measuring these change in capacitance, the fact that the plate was rotating, and by how much, was measured.

As the knee flexes and the plates rotate relative to one another, resistance is created.

One plate rotates with the mast, connected by idle links, while the other does not rotate.