Rat's tail crane, 1735-1752.
© Science Museum / Science & Society Picture Library
Model. This type of crane was common in the 18th century. It was operated by men, horses or donkeys walking inside the wheel, or sometimes by means of a rope outside the wheel. It was used to move cargo or masonry. This model is asociated with Dr Stephen Demainbray (1710-1782), a famous science lecturer of the 18th century.