Camera lucida, 1876.
© Science Museum / Science & Society Picture Library
Diagrams of the components of a camera lucida. The camera lucida, a small hand-held instrument designed for drawing in daylight, was invented by the English optical physicist William Hyde Wollaston (1766-1828) in 1806. It uses a prism to concentrate and project the light from an object onto a piece of paper, onto which it can then be traced.