epicycloidal wheel

The “little joker” was a small tin wheel with a wire attached to it, which fit inside the combination of any bank safe.

Never again would he sit behind that wheel rejoicing in the insolence of speed.

He deposited it on the vacant seat, clambered up behind the wheel, and started.

The non-elastic character of water made it unsuitable for a machine requiring a fly-wheel.

To quote Mrs. Kaye, 'A Liberal peer is as useful as a fifth wheel to a coach, and as ornamental as whitewash.'

I think 6½ feet diameter for the fly, and 9½ inches diameter for the small wheel, will give speed enough to the drum.