Sidney Horstmann

Sidney was the youngest son of the German clockmaker Gustav Horstmann, who moved to England about 1850.

Gustav designed the world's first micrometer with an accuracy greater than 1/10000 of an inch.

They also worked with William Friese-Greene in the development of the first cameras for moving celluloid film.

He was responsible for developing a tracked coil spring suspension system known as the Horstmann bogie, which is used on many Western (particularly British) tanks, including the Centurion and Chieftain.

The suspension company eventually became Horstman Defence Systems[7] which (as of 2018[update]) retains a site in Bath.