File:HD Actinograph.jpg

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current20:45, 24 January 2009Thumbnail for version as of 20:45, 24 January 2009721 × 877 (217 KB)Svajcr{{Information |Description={{en|I took this picture of my '''Hurter & Driffield's Actinograph''', a boxwood/brass/cardboard two-slide slide rule.}} |Source=Transferred from [http://en.wikipedia.org en.wikipedia] |Date=2006-12-30 (original upload date) |Au

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