Sentence:  "Andrew Houſtoun" and "Adam Muſhet", being Tackſmen of the Excize, did <WSD>Imploy</WSD> "Thomas Rue" to be their Collector, and gave him a Sallary of 30. pound "Sterling" for a year. 
Meaning of the word marked with <WSD> tags:  To hire (somebody for work or a job).