Sentence:  The Customs, and Methods of Measuring of all Artificers Work, concern'd in Building; together with the City and Countrey Prices, not only of Workmanship, but of Materials also: The which will be extraordinary useful in making of Bargains, or Contracts betwixt the <WSD>Workmaster</WSD> and Workman; and likewise in computing the Value (or Charge of Erecting) of any Fabrick, great or small. 
Meaning of the word marked with <WSD> tags:  Master workman; overseer; employer of workmen.