On Display

Six inch silver sector, late 18th century.

Six inch silver sector signed "Ramsden, London" with attached set square, late 18th century. Sectors were used from the end of the 16th century until the mid 19th century for calculations involving proportion. They were ingraved with logarithmic and

 
Six inch brass sector, 1720-1753.

Six inch Brass sector 1720-1753 signed T Heath Fecit, decorated on hinge and legs with floral patterns. Sectors were used from the end of the 16th century until the mid 19th century to perform calculations involving proportion. They were inscribed w

 
Wine diagonal, 1797-1826.

Wine diagonal, a type of gauging rod, by J.Stutchbury, 1797-1826. These were used by Excise Officers together with slide rules to calculate the volume of wine in wine casks, and thence the duty payable. Until 1826 the volume of a wine gallon was diff

 
Klein bottle, 1995.

A single surface glass vessel made by Alan Bennett in Bedford, 1995. It consists of three Klein bottles arranged in a column which when cut form a pair of five-twist Mobius strips. A Klein bottle is a surface which has no edges, no outside or inside

 
'Magic Brain' calculator, c 1960.

Magic Brain' calculator made by Chadwick in tin and plastic, with stylus and instructions. C.1955. Very similar to the Exaxctus and other stylus calculators of the period, the Magic Brain could add, subtact, and multiply and duivide by repeated addit

 
 
 
 
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