Paul Reinmann
Paul Reinmann came from a family of mathematical instrument makers who lived and worked in Nuremberg. He was born in about 1557 and died in 1609. Reinmann made lots of small sundials out of ivory which people would carry around in their pockets. These sundials could tell the time in a number of different ways and folded up to take up less space. They were used by people to tell the time before watches were invented.

Reinmann's instruments are all very good quality and very well made with lots of detailed lines engraved of them. Although Reinmann had to have very good skills with his hands to be able to make his sundials, he also had to understand maths very well because all the lines on them had to be drawn exactly in the right position according to strict mathematical rules.