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Douglas engine, 1911.

Douglas engine, 1911.
3 6 c m
actual image size: 32cm x 28cm


This 350cc two-cylinder, air-cooled petrol motorcycle engine was introduced by the Douglas Brothers of Bristol in 1907 and includes improvements patented by William Douglas in 1911. The engine featured on Douglas motorcycles with few changes until 1925.

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© Science Museum / Science & Society Picture Library

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