How did James Watt become acquainted with Joseph Black?

James Watt became acquainted with Joseph Black after Watt opened a shop at the University of Glasgow in 1757 to manufacture mathematical instruments. During this period, Watt was employed as an instrument maker to the university, where he met many scientists, including Black, who was then a professor of anatomy and a lecturer in chemistry at the institution. The two men developed a close friendship and maintained a rich correspondence throughout their lives, even after Black’s time at Glasgow concluded.12