Pack of four rolls quilted toilet paper with Penrose tiling
1997
Napier's Bones
1690
Burroughs hand operated adding and listing machine
1913
Navigational Computor Mark III
Slide rule by Robert Bissaker
1654
Geometrical Groin Vault, string surface model
1872
Washington calculator for problems of reinforced concrete
A Stchety, Russian Abacus.
1901-1930
Comptometer, manual operation
1930-1940
Arithmometer by Elliott Brothers
1885-1894
Drawing instruments by Charles Whitwell
1593-1610
Architect's drawing instruments
Pair of seventeenth-century dividers
1600-1699
Muldivo 'Mentor' calculator model WSR, 160 c1955.
circa 1955
Gunter sector signed Elias Allen
1623
Addac adding machine
1926
Morland's calculating machine
1666-1680
Spiral slide-rule
1663
Double surface of revolution of constant negative curvature
1910
Thales manual barrel calculating machine
1950-1960
Sector signed John Allen
1630-1642
Compendium rule signed Humfrey Cole
1574
Felt and Tarrant Comptometer, 1887.
circa 1900
Burroughs hand operated adding and listing machine
1917
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
Infant death rate and income
1926-1928
Burroughs Class 5 hand operated mechanical adding machine with ten registers
1920-1925
Multo calculating machine made by Addo
1955-1965
12 inch architectonic sector in ivory and silver
1733-1795
Slide rule for exchange of weights and measures
1815
Early model wooden-case comptometer by Felt and Tarrant Manufacturing Co.
1887-1903
Slide rule, "System Rietz", by Sun Hemmi, Japan
Cassina LC1 Armchair
2015
Burroughs Class 4 1000 hand operated adding and listing machine with keyboard for Sterling currency
1925-1935
Silver sector signed by Culpeper
1700-1737
Calculating rule by Lenoir in centimetres with conversions
1800-1830
Sector by Charles Whitwell
1600-11
Multo Brunsviga type barrel calculating machine
1950-1960
Revolution of constant negative curvature
1910
Ready reckoner for ship's cargoes
1807
Ready reckoner
1990
National 3000 automatic bookkeeping calculating machine
1935-1945
Special metal protractor for machine for finding the roots of cubic equations
Samuel Morland's calculating machine
1666-1695
Meccano differential analyser, 1947
1934; 1947
Calculating machine (arithmometer), Paris, France, 1880-1900
1880-1900
Stanhope square demonstrator, c.1805.
circa 1805
Square signed "J.Ramsden, 1757"
1757
'Polygraphic papers' coder/de-coder
Medieval Exchequer Tally Sticks
circa 1440