Johannes Faulhaber was a German mathematician and fortification engineer.
He was a weaver, but studied mathematics and showed such aptitude that the city authorities appointed him the city mathematician and surveyor, a surveyor. In 1600, Faulhaber opened his own school in Ulm, and worked on the fortification of Basel, Frankfurt, and many other cities. He also designed water wheels in Ulm and made mathematical and geodetic instruments, particularly for military purposes.
Among the scientists with whom Faulhaber collaborated were Kepler and van Ceulen. He made the first German publication of Briggs' logarithms, and also made the first illustrated descriptions of Galileo's compass.
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