• (n.) The performer of any work; a master workman.
Work'mas`ter noun The performer of any work; a master workman. [ R.] Spenser. 
The Auster J/1U Workmaster is a British agricultural aircraft designed for crop spraying, first flown in 1958, just 53 days after the design plans were presented to the production workshop. The Auster J/1U Workmaster is a high-wing braced monoplane powered by a Lycoming O-360-A four-cylinder horizontally opposed air-cooled engine providing a top sp...