Letter, from Francois Bayle to Henry Oldenburg Autograph letter about Bayle's invention of a windmill which will be able to raise water; if the Royal Society is interested Bayle will send a diagram; stating that there are other unfinished treatises on motion of liquids in vessels and of solids in liquids Francis Bayle (1622-1709) was a physician and professor at University of Toulouse Samuel de Fermat sent this letter (see EL/F1/47) July 1669