1897 - 1904
John Simpson was an inventive engineer who made about 20 steam cars of varying designs, mainly for his own interest and use, though he sold some of them. An early model had a 6hp 4-cylinder single-acting engine and double suspension - the chassis was sprung on the axles in the usual way, and the body was sprung on the chassis, as in the first Rational car. Later examples of Simpson's work had engines of 6, 10 and 12hp, flash boilers and automatic regulators for fuel and water.
Source: Nick Georgano / The Beaulieu Encyclopaedia of the Automobile