Other inventions.2C proposals and works John Isaac Hawkins

improved lathe chuck, drawing 1808 article hawkins.



experiments in 1810–11 brick pedestrian tunnel under thames, charles wyatt, proposal thames archway company
the mechanical pencil (1822); rights sold sampson mordan , gabriel riddle.
trifocal corrective eyeglass lenses, patented in 1827, coining name bifocal dual focal length lenses invented benjamin franklin
sugar refining, method of edward charles howard whom had worked.
the iridium-tipped gold pen (1834). platinum-nib pens iridium tips sold @ guinea.
translated treatise on teeth of wheels french of charles Étienne louis camus, , advocated involute profile gears (by 1840)
perfected perkins steam gun, intended eliminate warfare making resistance impossible.




^ explanation of mr. jn\o i. hawkins physiognotrace letter t. jefferson charles wilson peal (on website of lewis , clark fort mandan foundation)
^ “moses williams, cutter of profiles”: silhouettes , african american identity in republic gwendolyn dubois shaw archived 11 june 2011 @ wayback machine. describes methods of using physiognotrace
^ mechanization of likeness in jeffersonian america wendy bellion (mit communications forum)
^ andrea seabrook, obama wields ... autopen?
^ murphy d. smith, due reverence: antiques in possession of american philosophical society (1992), p. 37; google books.
^ david getsy, sculpture , pursuit of modern ideal in britain, c. 1880–1930 (2004), p. 142; google books.
^ mapping profession of sculpture, benjamin cheverton.
^ henry christmas, george augustus frederick fitzclarence, literary gazette, vol. 21 (1837), p. 593; google books.
^ repertory of arts, manufactures, , agriculture, vol. 13, issues 73–78 (1808), p. 43; google books.
^ repertory of patent inventions (1826), pp. 31–6; google books.
^ university of rochester page on context brunel tunnel.
^ sholto percy, mechanics magazine , journal of science, arts, , manufactures, vol. 27 (1837), p. 32; google books.
^ elisabeth bennion, antique medical instruments, los angeles: university of california press, 1979, p. 244 google books.
^ stein, harold a. (2012). ophthalmic assistant: text allied , associated ophthalmic personnel (9th ed.). philadelphia: elsevier mosby. p. 205. isbn 978-1-4557-3346-0. 
^ repertory of patent inventions vol. 5 (1828), p. 219; google books.
^ pens , new international encyclopædia, vol. 13, new york: dodd, mead , company, 1903, pp. 883–4 [1]
^ william mattieu williams, science notes: john isaac hawkins , brain growth, in gentleman s magazine, vol. 258, january–june 1885, p. 510; archive.org.
^ patent 5271289 archived 12 june 2011 @ wayback machine. – non-involute gear, reference hawkins s translation of treatise on teeth of wheels
^ thompson, reminiscences, p. 15