International Harvester 10/20 tractor, 1925.
© Science Museum / Science & Society Picture Library
In 1921 the International Harvester Corporation (IHC) introduced the next generation of their lightweight tractor designs with the 15/30, and by 1923 they had introduced a smaller version, the 10/20. Both tractors shared some novel features. IHC had adopted Fordson's cast unit construction, but had modified the idea by providing a cast iron hull forward of the gearbox in which the engine sat separately, unlike the Fordson where the engine was an integral part of the tractor's structure. This did offer certain benefits when it came to maintenance. A very reliable tractor, the 10/20 was very popular in Britain, if one could afford one over a Fordson. Production in the United States ended in 1939, but a few still came into Britain for a couple of years after that date.