• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
  • support@email.com
  • ALRO-made ruler unusually with a cursor for analysing ECG printouts of the cardiac Sinus Rhythms
  • Hatters Gauge - for measuring the size of a hat but unusually calibrated in metric & imperial
  • Glovers Rule - for measuring the length of a glove
  • Unusual non-logarithmic squaring desktop QR 41 model by Dennert & Pape (D&P)
  • Colour combinations slide rule for Interior Designers
  • Professor Fuller’s Drum Calculator from 1878 - made by W.F. Stanley
  • Modern Kienzle wristwatch with slide rule bezel calculator
  • Ruxton Multi-Vider drop-lead pencil & slide rule
  • Rare Otis King Model N for Retail & Monetary with white scales (422 & 424) on a black background
  • Darnley’s Rotable Lightning Calculator/Pencil Case
  • Design for this Antenna Radar Beam Pattern Detection slide rule was classified during WWII by UK & US governments - made by Lawrence
  • Makeba Kombinator pencil & slide rule
  • Rare Carbic-made Fischer Calculator
  • Specialist slide rule for a national home cable radio broadcasting system offered in The Netherlands from 1930 to1970
  • Smallest drum (≈ 2.4m) made by LOGA

Son of a bus driver ....


My mother always insisted he was a “coach driver” but no matter, from my father I inherited a love of motoring. I was born in England but apart from growing up and marrying Ros in the UK, since 1975 the family home has been in one of the famous bulb-growing areas of The Netherlands. Ros and I hold dual Dutch and British nationality - so no pre or post BREXIT problems!

I worked 25 years for an Oil Major – ending up as a Global I.T. Strategist. Retiring early, Ros and I enjoy travelling and watching our married daughter Siân’s family grow up – we have a granddaughter Zara and a grandson Owen.

By harnessing the WWW to share my collection and my published articles will, I hope, provide a useful source of information to other avid collectors or just surfing visitors to the website.

I am a member of the British Slide Rule Circle (UKSRC), the Dutch Circle for Historical Calculating Instruments (KRING) and the German Rechenschieber-Sammler-Treffen (RST) online group. I am also a Fellow, 2011 Award winner and since 2021 a Director of the American Oughtred Society.

If you have any questions or you are just looking for a good home for your trusty slide rule please use the details shown in the footer below or in the CONTACT tab above to get in touch.

Eur Ing. David Rance

Retired from work but not from life!