Master Clock
A clock which is carefully regulated and used to correct others, by electricity or otherwise. 2. The original clock model from which others are made.
How to true a balance, repair a chipped dial, temper a spring or test a stone — the working bench-book of the American watch trade, arranged A to Z.
A clock which is carefully regulated and used to correct others, by electricity or otherwise. 2. The original clock model from which others are made.