Doctor Illuminatus Ramon Llull is an amazing figure in the field of philosophy during the Middle Ages, and one of the first people who tried to make logical deductions in a mechanical, rather than a mental way.
In Leonardo’s manuscript Codex Madrid I, compiled by the genius in 1493, when he served at the Castle of Milan under the duke Ludovico il Moro, there is a sketch, picturing a mechanism, which is very likely to be designed for calculating purposes. Leonardo da Vinci is probably the most.
Jean Salomon de Caus was a French Huguenot engineer and scientist, who spent his life moving across Europe. He worked as a hydraulic engineer and architect under Louis XIII from 1623 till his death in Paris in 1626.