Supplementary material IM2019

These animations show some items presented at the 25th “International Meeting of Collectors of Calculating Instruments”, Den Haag and Scheveningen, 2019.

• ALRO calculating discs: (photo's: Otto van Poelje)
  • AC-1.02: ALRO Patent, outer disk and cursor can be rotated.
  • AC-1.05a: “200 R” (Rietz S T S&T N² N = N N² R N³), scale and cursor can be rotated.
  • AC-1.13: “Ha.V” (Handel, inverse C-scale: R = N), scale and cursor can be rotated.
  • AC-1.16: “Syst. ALRO HaTex” (later version N = N UK-currency)
  • AC-1.17a: “1010 Commercial” (Long Spiral Scale N × 6), scale and one cursor can be rotated.
  • AC-1.22: “ALRO Patent, Beton” (Reinforced Concrete Strength Design) outer disk and cursor can be rotated
  • AC-1.23: “Syst. ALRO Chem”, outer disk and cursor can be rotated.
  • AC-1.24: ALRO “Discabois - Syst J C Brouhon” (Wood & Forestry), outer disk and cursor can be rotated.
  • AC-1.25: “Piret” (Metal Wire Drawing), outer disk and cursor can be rotated.
  • AC-1.32: ALRO Military Disk, cursor and outer scale can be rotated.
  • AC-1.48: ALRO “Cycloop Kipp” (front: oximeter), cursor and outer disk can be rotated.
  • AC-1.48: ALRO “Cycloop Kipp” (back: diaferometer), cursor and outer disk can be rotated.
  • Oximeter Slide Rule Mk 1, inner disk can be rotated. (variant of AC-1.48, published in W.G. Zijlstra, “A manual of reflection oximetry and some other applications of reflection photometry”, Van Gorcum, 1958)
  • AC-1.39: ALRO “Klinische Rekencirkel Dr. A. Lips” (front), outer disk and cursor can be rotated.
  • AC-1.39: ALRO “Klinische Rekencirkel Dr. A. Lips” (back), outer disk and cursor can be rotated.
  • AC-1.40: “Shell Viscoklok” (Temp. Viscosity in SSU R.I. °E cS), outer disk and cursors can be rotated. See manual.
  • AC-1.52: ALRO Demo, cursor and outer scale can be rotated.
• Spitzglass (description: Robert Adams, image: US Patent 1,145,042)
• Richardson’s 1898 Slide Rule (description: José Fernandez)
• LOGA calculating discs (photo'sfoto's: Nico Smallenburg)
  • LOGA Modell Präzision 6400 A ‰, outer scale and cursor can be rotated.
  • LOGA Modell TOPO 6400 A ‰ (front and back), inner scales and cursor can be rotated.
  • bonus: LOGA 75 Mod RZ, LOGA 75 E, LOGA 75 EA, LOGA 75 T, LOGA Terminator, LOGA 30 Rtx, LOGA 30 Tt, LOGA 30 RC LOGA 30 E (oxygen calculator), LOGA 30 sT, LOGA slide rule
• Cask Gauging (Werner H. Rudowski)
  • Polymeter (scheme)
  • Fig. 24a: linear scales
  • Fig. 24b: Sector
• Flying Fish I-J (photo: Jorge Fabregas)
• Mader-Ott Harmonic Analyser (description: Detlef Zerfowski)
• ML 420A Relative Humidity Calculator (Chris Hakkaart) Nov 30, 2019
• One-Offs:
  • Takamatsu, inner scale and cursor can be rotated. (photo: Chris Hakkaart)
  • Stanley Pipe Calculation Slide Rule, two slides can be shifted. (photo: Chris Hakkaart)
  • Vizzini's Calculating Table (Nathan Zeldes, Nicola Marras, Alvaro Gonzalez Firpi)
  • ALKU (photo: David Rance) Oct 2, 2019: thanks to Ronald van Riet

For more IM's, see the international page.