Napier's Bones
1690
Navigational Computor Mark III
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
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
Pair of seventeenth-century dividers
1600-1699
Stanhope square demonstrator, c.1805.
circa 1805
Sector signed John Allen
1630-1642
Sector by Charles Whitwell
1600-11
Arithmometer by Elliott Brothers
1885-1894
Ready reckoner for ship's cargoes
1807
Gunter sector signed Elias Allen
1623
Spiral slide-rule
1663
Compendium rule signed Humfrey Cole
1574
Square signed "J.Ramsden, 1757"
1757
Slide rule for exchange of weights and measures
1815
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
Felt and Tarrant Comptometer, 1887.
circa 1900
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
`Polygraphic papers' coder/de-coder
Infant death rate and income
1926-1928
Architect's drawing instruments
Morland's calculating machine
1666-1680
Ready reckoner
1990
12 inch architectonic sector in ivory and silver
1733-1795
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
Brunsviga calculating machine
1931-1939
Diene's multi-base arithmetic blocks, 1960-1965.
1960-1965
Pack of four rolls quilted toilet paper with Penrose tiling
1997
Medieval Exchequer Tally Sticks
circa 1440
Roman abacus
1974
Comptometer by Felt and Tarrant Manufacturing Co.
1925-1927
Drawing Set
1840-1890
Set 30 stereoscopic cards illustrating stereometry and spherical trigonometry
1870-1876
Set of 46 stereoscopic cards illustrating crystallography
1876