By the 19th century, Kepler's description had fallen into oblivion, so Wollaston's claim was never challenged. The basic optics were described 200 years earlier by the German astronomer Johannes Kepler in his Dioptrice (1611), but there is no evidence he or his contemporaries constructed a working camera lucida. The camera lucida was patented in 1806 by the English chemist William Hyde Wollaston. This allows the artist to duplicate key points of the scene on the drawing surface, thus aiding in the accurate rendering of perspective. The artist sees both scene and drawing surface simultaneously, as in a photographic double exposure. The camera lucida projects an optical superimposition of the subject being viewed, onto the surface upon which the artist is drawing. A camera lucida is an optical device used as a drawing aid by artists and microscopists.
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