Addac adding machine
1926
Sector signed John Allen
1630-1642
Pair of seventeenth-century dividers
1600-1699
Compendium rule signed Humfrey Cole
1574
Sector by Charles Whitwell
1600-11
Slide rule for exchange of weights and measures
1815
Spiral slide-rule
1663
Slide rule, "System Rietz", by Sun Hemmi, Japan
Calculating rule by Lenoir in centimetres with conversions
1800-1830
Sector by Bion
1700-1720
Stanhope square demonstrator, c.1805.
circa 1805
Muldivo 'Mentor' calculator model WSR, 160 c1955.
circa 1955
Double surface of revolution of constant negative curvature
1910
Comptometer, manual operation
1930-1940
Arithmometer by Elliott Brothers
1885-1894
Burroughs Class 5 hand operated mechanical adding machine with ten registers
1920-1925
Thales manual barrel calculating machine
1950-1960
Revolution of constant negative curvature
1910
Burroughs hand operated adding and listing machine
1917
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
Square signed "J.Ramsden, 1757"
1757
Gunter sector signed Elias Allen
1623
Drawing instruments by Charles Whitwell
1593-1610
Silver sector signed by Culpeper
1700-1737
Slide rule by Robert Bissaker
1654
Napier's Bones
1690
Washington calculator for problems of reinforced concrete
Navigational Computor Mark III
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
Ready reckoner
1990
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
Morland's calculating machine
1666-1680
`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
Lord's Calculator
1880-1885
Mechanical analogue calculator
1935
Hyperboloid and Asymptotic Cone, surface string model
1872
Model of a Half-Twist Surface by Alexander Crum Brown, c 1900.
circa 1900
Soroban, Japanese, 1975-1978.
1975-1978
Box of sixty boxwood calculating rods
1690-1710