The Camera Lucida was for those artists who wanted to quickly record a scene with the correct prospective. The original design of the camera was published by William Hyde Wollaston in 1807. His design used a four-sided glass prism with angles that measured, 90 degrees, 67.5 degrees, 135 degrees, and another 67.5 degrees. Basically the light from the sun’s rays shine through the prism reflecting an image. The four-sided prism is mounted on a small stand above a sheet of paper. Then if the eye is placed half over the prism, there is a reflected image on the sheet of paper which then can be traced onto the paper. The stand is screwed onto the table and is about six to eight inched high.
http://www.cartage.org.lb/en/themes/arts/photography/photproces/cameralucid/history/history.htm
http://www.britannica.com/EBchecked/topic/90864/camera-lucida
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