Smeaton's pulley, 1842-1846.
© Science Museum / Science & Society Picture Library
Chromolithograph after his own drawing by Henry Champman, showing a pulley designed by mechanical and civil engineer John Smeaton (1724-1792). Smeaton was elected a Fellow of the Royal Society in the 1750s after presenting several papers on instruments and mechanical subjects. In 1756-1759 he built the third Eddystone lighthouse off Plymouth, which became the model for all subsequent rock lighthouses. Illustration from 'Diagrams of mechanics / under the supervision of the Society for the Diffusion of Useful Knowledge' published in London, 1842-1846.