Camera Lucida reinvented The camera lucida was patented in 1807 by William Hyde Wollaston «to facilitate accurate sketching of objects». It consists of a four-sided prism mounted on a small stand leaning over a sheet of paper. By placing the eye close to the upper edge of the prism so that half the pupil looks over the prism, the observer is able to see apparently lying on the paper, a reflected image of an object situated in front of the prism. He can then trace the image with a pencil. The basic optics were described 200 years earlier by Johannes...
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