Exhibits presented so far 44) The square root unit of the Friden SRW automatic square root mechanism 43) The concept for Maurel's calculating machine from 1842 42) The Piano Arithmomètre from the 1855 World Exhibition 41) The adding machine of Thomas de Colmar 40) The Walther DMKZ 39) The Curta 38) The carry of tens by Gottfried Wilhelm Leibniz 1677 37) Insight into the restoration work at the Arithmeum 36) The Atanasoff Berry Computer by John Atanasoff and Clifford Berry 35) Cylindrical four-species adapting segment machine from Anton Braun 34) Johann Jakob Sauter's adding machine from the late 18th century 33) Calculator from the 17th century - Burattini or Morland? 32) The adding machine by Charles Xavier Thomas from 1849 31) The “Grasshopper” by George B. Grant from 1871 30) The Centennial four-species calculating machine by George B. Grant 29) Didier Roth's coplanar toothed disk adding machine from 1842 28) Joseph Edmondson's circular stepped drum machine for all four basic arithmetic operations 27) Coplanar toothed disk adding machine by Charles Stanhope from 1780 26) “Matador” keyboard adding machine with crank 1906 25) The single column key adding machine by Ferdinand Hebentanz from the year 1873 24) Column adding machine by Moses and William Pullen from the year 1874 23) „The Improved Adding Machine“ by Caroline Winter from 1859 22) The arithmetic manipulator by Niccola Guinigi from 1858 21) Tito Gonnella’s coplanar adding machine with tooth lock washers from the year 1859 20) The automatically multiplying calculating machine by François Timoléon Maurel and Jean Jayet from the year 1846 19) The “Z25” transistor computer by Konrad Zuse 18) Arthur Burkhardt’s Arithmometer – the start of calculating machine production in Germany at the end of the 19th century 17) Didier Roth’s circular calculating machine for automatic multiplication from 1841 16) The mechanical calculator for all four arithmetical operations by Anton Braun (1727) 15) “The Millionaire” – Calculating machine for direct multiplication by Otto Steiger 14) The four-species calculating machine with a switching latch by Heyde and Büttner from the year 1883 13) Four-species calculating machine with a switching latch mechanism by Friedrich Weiss from the year 1893 12) Prototype of the four-species calculating machine with a switching latch mechanism by Curt Dietzschold from the year 1876 11) Christel Hamann’s “Gauss-Mercedes” calculating machine with the unique stepped disc from the year 1909 10) Jacob Auch's adding machine 09) The "Hamann Manus" calculating machine 08) Adding machine by Philipp Matthäus Hahn 07) The patent model of Thomas de Colmar’s Arithmomètre from the year 1820 06) Multiplication Instrument by Samuel Morland 05) Johann Christoph Schuster's calculating machine 04) Blaise Pascal's calculating machine 03) The mechanical calculator for all four arithmetic operations by Axel Jacob Petersson 02) The mechanical calculator for all four arithmetic operations by Johann Jakob Sauter 01) The first mechanical calculator for all four arithmetic operations by Gottfried Wilhelm Leibniz
