Invented one of the first calculators: the pascaline
Very neat machine see
http://www.thocp.net/hardware/pascaline.htm (at bottom)
Primitive by today's standards but he attempted to sell it commercially; imagine there was a nascent computer industry in the 17th century.
QuickSilver, or in particular its sequels, imagine just that!
Incidentally TheBaroqueCycle? has its own wiki: http://baroquecycle.wikia.com/