Napier's Bones
1690
Addac adding machine
1926
Medieval Exchequer Tally Sticks
circa 1440
Slide rule, "System Rietz", by Sun Hemmi, Japan
Calculating rule by Lenoir in centimetres with conversions
1800-1830
Stanhope square demonstrator, c.1805.
circa 1805
Double surface of revolution of constant negative curvature
1910
Muldivo 'Mentor' calculator model WSR, 160 c1955.
circa 1955
Comptometer, manual operation
1930-1940
Burroughs Class 5 hand operated mechanical adding machine with ten registers
1920-1925
Thales manual barrel calculating machine
1950-1960
Sector by Bion
1700-1720
Arithmometer by Elliott Brothers
1885-1894
Burroughs hand operated adding and listing machine
1917
Revolution of constant negative curvature
1910
Multo Brunsviga type barrel calculating machine
1950-1960
Early model wooden-case comptometer by Felt and Tarrant Manufacturing Co.
1887-1903
A Stchety, Russian Abacus.
1901-1930
Ready reckoner for ship's cargoes
1807
Sector signed John Allen
1630-1642
Gunter sector signed Elias Allen
1623
Spiral slide-rule
1663
Sector by Charles Whitwell
1600-11
Compendium rule signed Humfrey Cole
1574
Square signed "J.Ramsden, 1757"
1757
Slide rule for exchange of weights and measures
1815
Pair of seventeenth-century dividers
1600-1699
Navigational Computor Mark III
Washington calculator for problems of reinforced concrete
Geometrical Groin Vault, string surface model
1872
Burroughs Class 4 1000 hand operated adding and listing machine with keyboard for Sterling currency
1925-1935
Cassina LC1 Armchair
2015
Multo calculating machine made by Addo
1955-1965
Burroughs hand operated adding and listing machine
1913
Ready reckoner
1990
Felt and Tarrant Comptometer, 1887.
circa 1900
Morland's calculating machine
1666-1680
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
`Polygraphic papers' coder/de-coder
Infant death rate and income
1926-1928
12 inch architectonic sector in ivory and silver
1733-1795
Architect's drawing instruments
Slide rule by Robert Bissaker
1654
Silver sector signed by Culpeper
1700-1737
Drawing instruments by Charles Whitwell
1593-1610
Replica of Pascal's calculator
1926
Pack of four rolls quilted toilet paper with Penrose tiling
1997
Kelvin's Harmonic Analyser
1878
Brunsviga calculating machine
1931-1939
Klein bottle, 1995.
1995