noun.
In astronomy, a secondary clock in an observatory: used, generally, as an intermediary in the comparison of standard clocks: more fully, journeyman clock.
noun.
A man hired to work by the day; a day-worker.
noun.
A workman or mechanic who has served his apprenticeship; specifically, a qualified mechanic employed in the exercise of his trade, as distinguished from a master mechanic or a foreman.