Jacob Bernoulli
lived from 1655 to 1705

**Jacob Bernoulli** was a Swiss mathematician who was the first to use the term integral. He studied the catenary, the curve of a suspended string. He was an early user of polar coordinates and discovered the isochrone.

*Find out more at*:

http://mathshistory.st-andrews.ac.uk/Biographies/Bernoulli_Jacob.html