a Scottish mathematician, engineer and demonologist. The first Professor of Mathematics, Glasgow, he is known for Satan's Invisible Works Discovered, (c. 1685), a work on witchcraft. He wrote in all three areas of his interests, including an account of the “Glenluce Devil”, a poltergeist case from c. 1654, in a 1680 book mainly on hydrostatics and dealing also with coal. In 1684 he published as his own a work Truth's Victory over Error. It was in fact an English translation by Sinclair of the Latin inaugural dissertation given by David Dickson, who became Professor of Divinity, Glasgow in 1640, on the occasion in 1650 when he moved to Edinburgh. This was pointed out in short order.
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