"Enzyme Activity Calculator", card ready reckoner,

Mathematics

1970-1975

Hexecontahedron

Mathematics

1876

Stanley 5-inch lifting nib drawing pen, Great Tur

Mathematics

1876

Plus Rapid adding machine, standard farthings model

Mathematics

1939

Musketry rule with slider, window and two cursors.

Mathematics

1917-1925

'La Multi' calculator, c 1920.

Mathematics

1918-1922

Burroughs Class 1 automatic Burroughs Model F1300

Mathematics

1925-1935

Dinosaur Rubiks cube

Mathematics

1980-1989

Robertson's 'Rapid Calculator', c 1910.

Mathematics

1910-1920

Common groin

Mathematics

1872

Hyperboloid surface string model

Mathematics

1872

Geometry set

Mathematics

c. 1900

Section of model "F" controlled-key Comptometer by

Mathematics

1921

Aristo-Scholar, 0903-VS slide rule, Austrian manuf

Mathematics

1970-1975

Slide rule model 334/82

Mathematics

Silva Combi 2 map measurer for motorists and hikers

Mathematics

c. 1989

Lindstrom Record manual calculating machine, capac

Mathematics

1913

Adding machine, c.1910

Mathematics

c.1910

Manual transposition cipher 'Rasterschlüssel 44'

Mathematics

after 1944

Kentish's compound slide rule; boxwood, 4 slides,

Mathematics

1876

Timetable or rent rule, 1850-1860.

Mathematics

1850-1860

Slide rule, wood; by "W. & S. Jones, no.30 Holborn

Mathematics

1800-1860

Altitude slide rule for ballistics use by Dring &

Mathematics

1916

Slide rule, 12" x 1 1/2", for use with Sike's Hydr

Mathematics

1810-1820

Arithmetical medal and numerical pocket piece

Mathematics

1753

Protractor ivory, on ivory, 5"x1 9/16"

Mathematics

1876

Parallel rule, 18 inch, metal, rolling type

Mathematics

1876

12" Ullage Slide Rule (c. 1870), by DRING & FAGE T

Mathematics

1845-1882

Cordingley's computometer', adding machine, c 1900.

Mathematics

1890-1910

Filipowski's calculating rods (56), in mahogany ca

Mathematics

10-Inch MultiRietz 0929E Aristo slide rule from th

Mathematics

1970-1975

Ruler

Mathematics

1955-1965

Introduction to Decimal Quantity', teaching aid, 2000.

Mathematics

2000

Laundry tally board, c. 1680.

Mathematics

c. 1680

Adolf Sonnenschein's 'Arithmometer', late 19th century.

Mathematics

late 19th century

Steel dividers by W and C Wynn

Mathematics

1787-1899

Square Deal

Mathematics

1996

Arithmetical Jewel, 1619.

Mathematics

c. 1619

Two gilt bronze arithmetical medals, c.1753

Mathematics

1750-1755

Number balance 1980-1985

Mathematics

1980-1985

Course and distance calculator (German)

Mathematics

Folded copper sheet mathematical model.

Mathematics

1996

Chuckrum board, Indian, late 19th century.

Mathematics

late 19th century

Polyhedron model showing the icosahedron and one of its 58 stellations

Mathematics

1986-1987

One 7 1/2-inch brass sector

Mathematics

1720-1760

Surface string model

Mathematics

1872

Slide rule of boxwood (24 in) with two sliders, si

Mathematics

1793-1809

Model 13Z-18 twin Brunsviga mechanical calculating

Mathematics

1935-1939

Linear scale and folding square with quadrant arc

Mathematics

1757

Ebony pantograph by Gourdin, signed "No 37 Gourdin

Mathematics

1789