Ernst Otto Beckmann was a German pharmacist and chemist who is remembered for his invention of the Beckmann differential thermometer and for his discovery of the Beckmann rearrangement.

Solingen is a city in North Rhine-Westphalia, Germany. It is located some 25 km east of Düsseldorf along the northern edge of the region called Bergisches Land, south of the Ruhr area, and, with a 2009 population of 161,366, is after Wuppertal the second-largest city in the Bergisches Land. It is a member of the regional authority of the Rhineland.