












































Burroughs Model 6 calculator
US 1912 Loan of Gwen and Gordon Bell, B156.80






EXACTUS calculator
England c. 1950 Loan of Gwen and Gordon Bell, XB36.79












SEE calculator
US 1968 Loan of Gwen and Gordon Bell, B31.79






Chadwick MagicBrain Calculator
Japan c. 1960 Loan of Gwen and Gordon Bell, B1633.01












Baby Calculator
US c. 1940 Loan of Gwen and Gordon Bell, X213.83






Totalisateur Troncet
France c. 1890 102626667












Millionare
Hans Egli Switzerland 1895 Loan of Gwen and Gordon Bell, X17,78






Millionaire
Hans Egli Switzerland 1895 Loan of Gwen and Gordon Bell, X91.76












Victor W867 mechanical calculator
US c. 1935 Loan of Gwen and Gordon Bell, B370.86






Victor Tallymaster calculator
US c. 1965 Gift of Sam Bernstein, X1657.99












Bohn Contex desk calculator
Denmark 1960 Gift of Robert Olthoff, X43.81






Victor Model 738554
US c. 1955 102626617












IBM hexadecimal adder
US 1957 Gift of Tim Reif, 102630989






Chambon & Baye Tachylemme table
France c. 1880 Loan of Gwen and Gordon Bell, B201.80












The Adder
CH Webb US pat. 1889 Loan of Gwen and Gordon Bell, B1636.01






Marchant XL calculator
US 1910 Gift of Fred Gruenberger, X347.84












Barrett Figuring Machine
US c. 1936 Gift of John T. Cowles, X988.89






Star adding machine
US 1921 Loan of Gwen and Gordon Bell, B340.85












Precise adding machine
US c. 1910 Loan of Gwen and Gordon Bell, B188.81






American adding machine
US c. 1915 Loan of Gwen and Gordon Bell, XB180.81












Brunsviga 20 mechanical calculator
Germany c. 1910 Gift of Murlan Corrington, X762.86






Allen & Wales Desk Model
US c. 1910 Loan of Gwen and Gordon Bell, B500.88












RT & AM Addometer
US c. 1920 Loan of Gwen and Gordon Bell, B179.81






Golden Gem Adding Machine
US c. 1910 Gift of Gwen Bell, B266.83












“Consul, The Educated Monkey”
US pat. 1916 Loan of Gwen and Gordon Bell, B302.84






ADDICOSMOS B.U.G Calculator
US c. 1920 Loan of Gwen and Gordon Bell, B131.80












Olivetti Summa Quanta 20 calculator
Argentina c. 1960 Loan of Gwen and Gordon Bell, XB86.79






Burroughs printing adding machine
US c. 1920 Loan of Gwen and Gordon Bell, B42.80












Marchant ACRM adding machine
US c. 1932 Gift of Michael Smolin, 102632008






Burroughs Model 3 calculator
US pat. 1907 102626638












Thales Patent Calculator
Germany 1940 Loan of Gwen and Gordon Bell, XB84.79






‘R’ Adding Machine
Hamann Manus Germany c. 1925 Gift of Declan and Margrit Kennedy, XD190.80












Midget System Trinks
Brunsviga Maschinenwerke Grimm  Natalis & Co. Germany c. 1906 102626636






Odhner Universal Calculator
Sweden c. 1925 102626594












Original Odhner calculator
Sweden c. 1920 Gift of Henry Thacher, X546.85






Model ST10 electromechanical calculator
Friden Calculating Machine Co., Inc. US 1945 Gift of Andrew Egendorf, X1783.2000












Model SRQ 10 electromechanical calculator
Friden Calculating Machine Co., Inc. US 1964 Gift of Andrew Egendorf, X1816.2000






Thomas Arithmometer
France c. 1850 Loan of Gwen and Gordon Bell, B214.82












Tate’s Arithmometer
England c. 1900 Loan of Gwen and Gordon Bell, B82.80






Burroughs Model 5 calculator
US c. 1920 102626635












Burroughs Model 5 calculator
US c. 1920 102633501






Monroe LA5 desk calculator
US c. 1940 Gift of Gordon Osborne, X90.82












Monroe LA7160 calculator
Holland c. 1950 Gift of Andrew Egendorf, X1805.2000A






Monroe LA5160 calculator
US c. 19351960 Loan of Gwen and Gordon Bell, XB40.79












Monroe “Monromatic”
US c. 1945 Loan of Gwen and Gordon Bell, XB11.76






Printing Calculator
US c. 1900 102626633












Wales Visible Adding Machine
US c. 1925 Loan of Gwen and Gordon Bell, B88.80






Felt & Tarrant Comptometer
US c. 1950 Loan of Gwen and Gordon Bell, X465.84












Felt & Tarrant Comptometer
US c. 1925 102626589






Felt & Tarrant Comptometer
US c. 1917 Loan of Gwen and Gordon Bell, B1653.01












Felt & Tarrant Comptometer
US c. 1890 102626590






USSR c. 1932 Gift of Robert Garner, 102631006




















Bicycle Chain Sieve
US






Gear Sieve
US 1932 Gift of Derrick H. Lehmer, X85.82












16 mm Film Strip Sieve
US 1936 Gift of Derrick H. Lehmer, X87.82





