balance wheel

The old clock is prepared for use by removing the hands, balance wheel and escapement so that the wheels will turn freely.

There are two pairs of engines and pumps, working on cranks, set at right angles, and turning a balance-wheel seen behind them.

Christy saw that he had considerable mechanical genius, but he certainly lacked a balance-wheel.

With regard to balance-wheel clocks, it is more difficult to explain the mode of repairing, to the inexperienced.

On his desk a little clock was ticking, each motion of its balance-wheel bringing nearer the tragedy impending.