Pair of seventeenth-century dividers
1600-1699
Sector by Charles Whitwell
1600-11
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
Thales manual barrel calculating machine
1950-1960
Multo Brunsviga type barrel calculating machine
1950-1960
Double surface of revolution of constant negative curvature
1910
Revolution of constant negative curvature
1910
Sector signed John Allen
1630-1642
Ready reckoner for ship's cargoes
1807
Compendium rule signed Humfrey Cole
1574
Square signed "J.Ramsden, 1757"
1757
Gunter sector signed Elias Allen
1623
Slide rule for exchange of weights and measures
1815
Arithmometer by Elliott Brothers
1885-1894
Spiral slide-rule
1663
Slide rule, "System Rietz", by Sun Hemmi, Japan
Calculating rule by Lenoir in centimetres with conversions
1800-1830
Washington calculator for problems of reinforced concrete
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
Morland's calculating machine
1666-1680
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
`Polygraphic papers' coder/de-coder
Architect's drawing instruments
Cassina LC1 Armchair
2015
Burroughs hand operated adding and listing machine
1913
Infant death rate and income
1926-1928
Geometrical Groin Vault, string surface model
1872
Drawing instruments by Charles Whitwell
1593-1610
Silver sector signed by Culpeper
1700-1737
Slide rule by Robert Bissaker
1654
Ready reckoner
1990
Napier's Bones
1690
12 inch architectonic sector in ivory and silver
1733-1795
Ruler
1917
PIC Slide Rule
1955
PIC Slide Rule
1950
Parallel Ruler
1880-1900
Slide Rule Die
1955-1967
Globetrotter slide rule, 1960s
1960s
John Seller's 'Sea Gunner's Rule' 1695
1695