- Engine part seen in earliest cars and motorcycles - Rotating part - The odd charms of a wheel-shaft projection - Wheel-shaft projection - When buzzer went, became projection that rotates - A turning or sliding piece which, by the shape of its
periphery or face, or a groove in its surface, imparts variable or
intermittent motion to, or receives such motion from, a rod, lever, or
block brought into sliding or rolling contact with it. - A curved wedge, movable about an axis, used for forcing or
clamping two pieces together.
- A spinning part - Arm goes round. whichever way you look at it - Chopper blade - Going up or down, it goes round and round - Helicopter blade - Helicopter blade can go either way - Helicopter part