## On Display

Replica of a Bavarian counting cloth, 16th century. The original cloth is preserved at the Bavarian National Museum in Munich. Reckoning cloths were used as portable substitutes for counting boards. The letters on the cloth stand for various denomina

Replica of a quipu made from an original held at the Museum of Natural History, New York, in 1974. Quipus were used by the Incas during the 15th and early 16th centuries as records of all types of accounts. It was discovered in the early 20th century

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

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 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.

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, 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

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

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

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