Addac adding machine
1926
Comptometer, manual operation
1930-1940
Stanhope square demonstrator, c.1805.
circa 1805
Burroughs Class 5 hand operated mechanical adding machine with ten registers
1920-1925
A Stchety, Russian Abacus.
1901-1930
Burroughs hand operated adding and listing machine
1917
Early model wooden-case comptometer by Felt and Tarrant Manufacturing Co.
1887-1903
Muldivo 'Mentor' calculator model WSR, 160 c1955.
circa 1955
Multo Brunsviga type barrel calculating machine
1950-1960
Double surface of revolution of constant negative curvature
1910
Revolution of constant negative curvature
1910
Slide rule, "System Rietz", by Sun Hemmi, Japan
Pair of seventeenth-century dividers
1600-1699
Thales manual barrel calculating machine
1950-1960
Sector by Bion
1700-1720
Ready reckoner for ship's cargoes
1807
Sector signed John Allen
1630-1642
Compendium rule signed Humfrey Cole
1574
Square signed "J.Ramsden, 1757"
1757
Sector by Charles Whitwell
1600-11
Gunter sector signed Elias Allen
1623
Slide rule for exchange of weights and measures
1815
Spiral slide-rule
1663
Calculating rule by Lenoir in centimetres with conversions
1800-1830
Arithmometer by Elliott Brothers
1885-1894
Navigational Computor Mark III
Burroughs Class 4 1000 hand operated adding and listing machine with keyboard for Sterling currency
1925-1935
Multo calculating machine made by Addo
1955-1965
Felt and Tarrant Comptometer, 1887.
circa 1900
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
`Polygraphic papers' coder/de-coder
Architect's drawing instruments
Burroughs hand operated adding and listing machine
1913
Infant death rate and income
1926-1928
Geometrical Groin Vault, string surface model
1872
Washington calculator for problems of reinforced concrete
Drawing instruments by Charles Whitwell
1593-1610
Silver sector signed by Culpeper
1700-1737
Slide rule by Robert Bissaker
1654
Ready reckoner
1990
Morland's calculating machine
1666-1680
Napier's Bones
1690
12 inch architectonic sector in ivory and silver
1733-1795
Cassina LC1 Armchair
2015
Full automatic electric "MADAS" calculating machine
1927-1935
Webb's "Adder", patented 1889, with cover
1889-1900
Progression of four solid bodies (in clay) of Genus 2
1967
Klein bottle cut to form two single-twist Mobius strips
1995-1996
Soroban, Japanese, 1975-1978.
1975-1978
Box of sixty boxwood calculating rods
1690-1710