Supplementary material IM2010

16th “International Meeting of Collectors of Historical Calculating Instruments”
September 17th and 18th, 2010, Leiden, The Netherlands

• Stefan Drechsler, “The Planimeter of J. Gierer Invented by Misunderstanding”
  • Rechnerlexikon
  • J. Gierer, “Entwurf eines Planimeters…”
• Otto van Poelje, “N-Card”
  • Manual
  • Simulation
• Andries de Man, “Computing Linkages”
  • Four-bar linkages
  • Multiplier (US Patent 2,498,310)
  • Multiplier with curved inputs   (US Patent 2,498,312 fig. 13)
  • Divider with curved output   (US Patent 2,459,726)
  • Logarithmic linkage   (US Patent 2,340,350)
  • Three-bar log linkage   (Svoboda fig.5-28)
  • Eccentric three bar log linkage   (Svoboda fig.7-9)
  • Double harmonic (tangent)   (Svoboda fig.4-26)
  • Fourth three-bar tangent linkage   (Svoboda fig.6-12)
  • Combined tangent linkage   (Svoboda fig.6-15)
  • Posographe   (see also: Journal of the Oughtred Society, Vol. 28 Nr. 1, Spring 2019, p. 36-43)
  • Ureographe, a medical variant of the Posographe  (see also: Bulletin des sciences pharmacologiques, Vol.1-2, 1940, p.[6])
  • Consul, the Educated Monkey   (US Patent 1,188,490)
  • A predecessor of Consul, the Educated Monkey   (US Patent 1,286,112)
  • Spilker's linear equation solver   (Patent DE415286)
  • Imm's Balance computer   (US Patent 2,179,822)
  • Hagan Flow Calculator   (US Patent 2,527,282)
  and some non-computing linkages
  • Watt's linear movement
  • Peaucellier's linear movement
  • Chebyshev's linear movement

For more IM's, see the international page.