==External links==* The Stationary Engine Club of Sweden* A video on the history of the diesel engine, which also contains a demonstration and illustration of the hot bulb engine's working cycle*An article from Gas Engine Magazine on Mietz & Weiss hot bulb engines* Norwegian-made semi-diesel engines; the last semi-diesel Sabb ended in 1969
Prve prototipe so izdelali leta 1886, serijska proizvodnja se je začela leta 1981 pri podjetju Richard Hornsby & Sons kot Hornsby-Akroyd oil engine (pod licenco).