Napier's Bones
1690
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
Thales manual barrel calculating machine
1950-1960
Revolution of constant negative curvature
1910
Multo Brunsviga type barrel calculating machine
1950-1960
A Stchety, Russian Abacus.
1901-1930
Sector signed John Allen
1630-1642
Sector by Charles Whitwell
1600-11
Pair of seventeenth-century dividers
1600-1699
Sector by Bion
1700-1720
Arithmometer by Elliott Brothers
1885-1894
Ready reckoner for ship's cargoes
1807
Gunter sector signed Elias Allen
1623
Spiral slide-rule
1663
Square signed "J.Ramsden, 1757"
1757
Slide rule for exchange of weights and measures
1815
Addac adding machine
1926
Slide rule, "System Rietz", by Sun Hemmi, Japan
Comptometer, manual operation
1930-1940
Burroughs Class 5 hand operated mechanical adding machine with ten registers
1920-1925
Burroughs hand operated adding and listing machine
1917
Early model wooden-case comptometer by Felt and Tarrant Manufacturing Co.
1887-1903
Compendium rule signed Humfrey Cole
1574
Multo calculating machine made by Addo
1955-1965
Ready reckoner
1990
12 inch architectonic sector in ivory and silver
1733-1795
Slide rule by Robert Bissaker
1654
Drawing instruments by Charles Whitwell
1593-1610
Silver sector signed by Culpeper
1700-1737
Navigational Computor Mark III
Washington calculator for problems of reinforced concrete
Geometrical Groin Vault, string surface model
1872
Cassina LC1 Armchair
2015
Morland's calculating machine
1666-1680
`Polygraphic papers' coder/de-coder
Infant death rate and income
1926-1928
Architect's drawing instruments
Burroughs Class 4 1000 hand operated adding and listing machine with keyboard for Sterling currency
1925-1935
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
Brunsviga calculating machine
1931-1939
John Seller's 'Sea Gunner's Rule' 1695
1695
Replica of Pascal's calculator
1926
One of two replica Roman hand abaci.
1974
National 3000 automatic bookkeeping calculating machine no 101364 42-BT
1935-1945
Lord's Calculator
1880-1885