Addac adding machine

1926

Ready reckoner for ship's cargoes

1807

Sector signed John Allen

1630-1642

Pair of seventeenth-century dividers

1600-1699

Compendium rule signed Humfrey Cole

1574

Square signed "J.Ramsden, 1757"

1757

Sector by Charles Whitwell

1600-11

Gunter sector signed Elias Allen

1623

Slide rule for exchange of weights and measures

1815

Comptometer, manual operation

1930-1940

Stanhope square demonstrator, c.1805.

circa 1805

Arithmometer by Elliott Brothers

1885-1894

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

Spiral slide-rule

1663

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

Calculating rule by Lenoir in centimetres with conversions

1800-1830

Drawing instruments by Charles Whitwell

1593-1610

Silver sector signed by Culpeper

1700-1737

Slide rule by Robert Bissaker

1654

Geometrical Groin Vault, string surface model

1872

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

Ready reckoner

1990

Felt and Tarrant Comptometer, 1887.

circa 1900

Morland's calculating machine

1666-1680

Napier's Bones

1690

Comptometer by Felt and Tarrant Mfg. Co. Chicago

1915-1920

`Polygraphic papers' coder/de-coder

Architect's drawing instruments

12 inch architectonic sector in ivory and silver

1733-1795

Cassina LC1 Armchair

2015

Burroughs hand operated adding and listing machine

1913

Infant death rate and income

1926-1928

Ruler

1875

A.G. Thornton Folding Ruler

1890-1910

Ruler

1939

Full automatic electric "MADAS" calculating machine

1927-1935

Miniature Boy's surface with six loops, glass, 1998

1998

Boy's surface with only two loops, glass, 1998

1998

Steiner's Roman surface, glass, 1998

1999