(His job was to activate the release valve on an early steam engine. He rigged up a string to do that so he could play. James Watt incorporated this into his design.)

(Watt and Smith were contemporaries in Edinburgh. Not only that, but Smith arranged for Watt, who'd been driven from business by the blacksmith's union (the Hammermen), to have an appointment and facilities at the University of Edinburgh. I'm fairly convinced they shared drinks at the local pub and swapped war stories.)

> It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest. We address ourselves, not to their humanity but to their self-love, and never talk to them of our own necessities but of their advantages.

http://geolib.com/smith.adam/won1-02.html