


Napier's Bones
1690

Slide rule, "System Rietz", by Sun Hemmi, Japan

Addac adding machine
1926

Calculating rule by Lenoir in centimetres with conversions
1800-1830

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

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

Arithmometer by Elliott Brothers
1885-1894

Revolution of constant negative curvature
1910

Multo Brunsviga type barrel calculating machine
1950-1960

A Stchety, Russian Abacus.
1901-1930

Ready reckoner for ship's cargoes
1807

Sector signed John Allen
1630-1642

Gunter sector signed Elias Allen
1623

Spiral slide-rule
1663

Sector by Charles Whitwell
1600-11

Compendium rule signed Humfrey Cole
1574

Square signed "J.Ramsden, 1757"
1757

Slide rule for exchange of weights and measures
1815

Pair of seventeenth-century dividers
1600-1699

Klein bottles, 1995
1995

Washington calculator for problems of reinforced concrete

Geometrical Groin Vault, string surface model
1872

Cassina LC1 Armchair
2015

Multo calculating machine made by Addo
1955-1965

Ready reckoner
1990

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

Slide rule by Robert Bissaker
1654

Silver sector signed by Culpeper
1700-1737

Drawing instruments by Charles Whitwell
1593-1610

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

Medieval Exchequer Tally Sticks
circa 1440

Brunsviga calculating machine
1931-1939

Steel Rule
1900

Triumphator hand-operated calculator
1935-1945

drawing instrument sets; dividers (compass)

Two boxed sets of Genaille's rods
1885