Felix Brown and his brother Adolphus have been practical inventors of machinery. They brought many improvements to existing technologies. For example they succeeded in building an oscillating steam engine,
In 1877 Felix Brown patented a much improved caloric engine that pushed the practical size limit from 6 HP to 14 HP.
It has been his sole known air engine. But it was quite famous at that time.
|1877||Brown patent #186,535||Caloric Engine|