What happened from September 2015?

  • June 2021: Update to new mkdocs and MathJax3.
  • May 2018: Video with Cellatron R43SM
  • October 2017: Video with MADAS ATG Triplex
  • January 2017: Video comparing the speed of three Marchant calculators and MADAS
  • November 2016: Video and an article on Marchant ACT 10M
  • September 2016: Youtube video chanels on old calculators
  • September 2016: Video with Marchant Silent Speed, model D
  • July 2016: Video with Mercedes Euklid R27
  • April 2016: Video with Madas 20 AS
  • February and March 2016: The article and the video about Diehl KR15 calculator
  • February 2016: Video on Mercedes Euklid 21.
  • December 2015: Video which shows multiplication and summing products on three different models of Mercedes Euklid. Among others, it is shown that 2016 is a funny number. Happy New Year 2016!
  • December 2015: Video which shows how negative result is presented on mechanical calculators and how to read it.
  • November 2015: Video with Walther calculator dividing with precision to 60 digits.
  • October 2015: Video with eletromechanical calculator Brunsviga 11 S and cube root from Marchant tables.
  • September 2015: Article which explains function of planimeters from geometric point of view. Unified theory for all three types of planimeters described in previous article on planimeters
  • September 2015: Video attached to the (czech) page describing electromechanical calculator Brunsviga 11S is in English. Shows several rational approximation of $\pi$. All approximations are performed on ancient calculators, most of them on Brunsviga 11S.