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Edwin Thacher's 1881 Slide Rule Patent

  Link Details for: Edwin Thacher's 1881 Slide Rule Patent
Link Title: Edwin Thacher's 1881 Slide Rule Patent Open in a new window
Link URL: http://www.americanartifacts.com/smma/thachpat.htm
Link Details: Specification forming part of Letters Patent No. 249117, dated November 1, 1881. Includes diagrams.
Category: Top : Science : Math : Education : Slide_Rules
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Edwin Thacher's 1881 Slide Rule Patent