Thales manual barrel calculating machine
1950-1960
Burroughs Class 4 1000 hand operated adding and listing machine with keyboard for Sterling currency
1925-1935
Addac adding machine
1926
Calculating rule by Lenoir in centimetres with conversions
1800-1830
Slide rule, "System Rietz", by Sun Hemmi, Japan
Comptometer, manual operation
1930-1940
Early model wooden-case comptometer by Felt and Tarrant Manufacturing Co.
1887-1903
Double surface of revolution of constant negative curvature
1910
Multo Brunsviga type barrel calculating machine
1950-1960
Burroughs Class 5 hand operated mechanical adding machine with ten registers
1920-1925
A Stchety, Russian Abacus.
1901-1930
Revolution of constant negative curvature
1910
Muldivo 'Mentor' calculator model WSR, 160 c1955.
circa 1955
Slide rule for exchange of weights and measures
1815
Pair of seventeenth-century dividers
1600-1699
Stanhope square demonstrator, c.1805.
circa 1805
National 3000 automatic bookkeeping calculating machine
1935-1945
Arithmometer by Elliott Brothers
1885-1894
Square signed "J.Ramsden, 1757"
1757
Sector signed John Allen
1630-1642
Compendium rule signed Humfrey Cole
1574
Sector by Charles Whitwell
1600-11
Spiral slide-rule
1663
Ready reckoner for ship's cargoes
1807
Gunter sector signed Elias Allen
1623
Burroughs hand operated adding and listing machine
1917
Special metal protractor for machine for finding the roots of cubic equations
Calculating machine (arithmometer), Paris, France, 1880-1900
1880-1900
Ready reckoner
1990
'Polygraphic papers' coder/de-coder
Burroughs hand operated adding and listing machine
1913
Navigational Computor Mark III
Cassina LC1 Armchair
2015
Felt and Tarrant Comptometer, 1887.
circa 1900
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
Multo calculating machine made by Addo
1955-1965
Geometrical Groin Vault, string surface model
1872
Washington calculator for problems of reinforced concrete
Infant death rate and income
1926-1928
Drawing instruments by Charles Whitwell
1593-1610
Architect's drawing instruments
Morland's calculating machine
1666-1680
12 inch architectonic sector in ivory and silver
1733-1795
Napier's Bones
1690
Slide rule by Robert Bissaker
1654
Silver sector signed by Culpeper
1700-1737
Samuel Morland's calculating machine
1666-1695
Meccano differential analyser, 1947
1934; 1947
Kelvin's Harmonic Analyser
1878
Napier's bones or rods
1671-1700