Yesterday I didn’t remember to show Kircher’s Organum Mathematicum:
Organum Mathematicum was invented in 1661 by the Jesuit astronomer and mathematician Athanasius Kircher. This device is a comprehensive portable encyclopedia and is designed for the following disciplines: arithmetic, geometry, fortifications, chronology, gnomonics (sundials), astronomy, astrology, steganography (encoding) and music. The case contains tables for calculations without ‘tiring the mind’. Each of the nine disciplines contains 24 flat boards of different colours, with definitions and information.
This is Athanasius Kicher:
Of course, in the exhibition you can also find compasses, rules, abacus, slide rules, the Napier bones,…
…and calculators from the 20th century: