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    Drawing made with a Spirograph, 1975.

    A pattern drawn using a Spirograph, a popular graphic toy used to draw combinations of curves.

    Set of mathematical instruments, c 1701.

    Set of mathematical instruments made by D Lusuerg of Rome, 1701. The range of this set of instruments is unusually extensive, from ordinary dividers to a geometric quadrant. It also includes a circle of degrees with pointers in the shape of grotesq

    Cordingley's computometer, adding machine, c 1900.

    Cordingley computometer adding machine c.1900. The Cordingley adding machine was one of several simple devices introduced around 1900. It is based on Blaise Pascal's (1623-1662) design of 250 years earlier.

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

    A. Sonnenschein's improved Arithmometer' made by George Philip and Son of London and Liverpool, late 19th century. This device, which showed units, rods of 10s, and squares of 100s, anticipated many 20th century arithmetical teaching aids. Sonnensche

    'La Multi' calculator, c 1920.

    La Multi, prototype of French calculating device based on Napier's bones, seven figures, c. 1920. This is a prototype of an instrument which did not prove successful. Napier's bones, a calculating device invented by John Napier in 1617, allowed the u

    'Baby Calculator', 1958-1962.

    `Baby Calculator' stylus adding device by Glenview, Illinois, USA, c. 1960. Like the Exactus, this is one of a number of simple stylus machines introduced in the mid 20th century. It performs multiplication and division by repeated addition and subtr

    School exercise book, 1814.

    The maths exercise book comprises hundreds of mathematical problems and calculations in the fields of numeration, trigonometry, navigation, astronomy etc. Includes numerous diagrams and several pen and ink drawings of rigged three-masters. Compiled b

    School exercise book, English, 1862.

    Mathematical exercise book for Master F. Ashton attending at Mr. Knagg's Classical Mathematical & Commercial Academy at Westow Hall, Kirkham near York, dated Oct. 11th, 1862. Printed by Bean Stationer, Leeds. Small private academies provided most of

    Klein bottles, 1995..

    A single surface glass vessel made by Alan Bennett in Bedford, United Kingdom. It consists of three Klein bottles sharing an inlet tube which when cut produces three pairs of single-twist Mobius strips. A Klein bottle is a surface which has no edges,

    Klein bottle, 1995.

    A single surface model made by Alan Bennett in Bedford, 1995. It consists of a Klein bottle cut to form two interlinked three-twist Mobius strips. A Klein bottle is a surface which has no edges, no outside or inside and cannot be properly constructed