File:SketchpadDissertation-Fig9-4.tif

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English: Construction of a linkage in Sketchpad (left) that generates a conic section. The time exposure at the right shows the resulting conic section traced by the moving point. This figure from Ivan Sutherland's famous Sketchpad dissertation was scanned, with permission from Sutherland, using an original paper copy of the dissertation. It has been previously published online in an electronic edition prepared by Alan Blackwell and Kerry Rodden, and freely available at http://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-574.html The original high resolution scans used to create the electronic edition are now being placed on Wikimedia commons in accordance with Sutherland's wishes to make this work freely available. His original research was carried out under a U.S. National Science Foundation Fellowship.
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Source Electronic edition of Sutherland's Sketchpad dissertation, edited by Blackwell & Rodden
Author Scanned by Kerry Rodden from original photograph by Ivan Sutherland
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current15:38, 26 January 2011Thumbnail for version as of 15:38, 26 January 20111,193 × 470 (550 KB)AlanBlackwell (talk | contribs){{Information |Description={{en|1=15 second time exposure of an animation created by Sketchpad, showing the paths of four points that are constrained by a mechanical linkage. This figure from Ivan Sutherland's famous Sketchpad dissertation was scanned, wi

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