On Display

    Klein bottle, 1995.

    A single surface glass vessel made by Alan Bennett in Bedford, 1995. It consists of a five-layered sphere with added access routes which when cut produces a pair of single-twist Mobius strips. A Klein bottle is a surface which has no edges, no outsid

     
    Brass sector by George Adams, 1756-1760.

    Nine inch brass sector, by Adams; engraved "Improv'd and made by Geo. Adams, Mathm. Inst. Maker to His Royal Highness, George Prince of Wales, London", in fishskin case. Sectors were used in calculations involving proportion. They contain logarithmic

     
    Carpenter's slide rule, 1825-1860.

    Carpenter's 2-foot folding rule in boxwood with logarithmic slide, made by James Rabone & Sons, Birmingham, mid to late 19th century. This is a standard carpenter's rule of the period and includes scales for calculating the volume of wood and the p

     
    French sector, 1751-1774.

    Brass French sector by Canivet, Paris, 1751-1774. French sectors are less complicated than English sectors. They are also used for calculations involving proportions of length, area and volume.The lines radiate from the centre of the hinge.

     
    Set of mathematical instruments by George Adams, mid 18th century.

    Set of mathematical drawing instruments by G.Adams, in Sheraton case, oak and mahogany, mid 18th century. The case contains a sector, parallel ruler, pair of callipers, rectangular protractor, curve drawing instrument and compasses and dividers.

     
    Six inch brass gunners callipers, c 1770.

    Gunners callipers, 6 inch by H.Gregory, brass 18th century. These callipers ere used for measuring the diameter of cannon balls, or by crossing the arms, the bore of a cannon..

     
    Navigation slide rule, c 1800.

    A 2 foot boxwood slide rule for navigators, c.1800. 'Sliding Gunters' , or navigator's rules with a slide are comparatively rare, as most navigators preferred to stick with the ordinary 'Gunter' scale based on the combination of trigonometric, logari

     
    Mechanical counting device, c 1900.

    Mechanical counting device, c 1900. Devices for counting the revolutions or repetitive actions of machines were developed from the mid 19th century.

     
    Smith and Dolier's arithmetical scales, late 19th century.

    Set of 'arithmetical scales' by Smith and Dolier, late 19th century. These 'scales' were used to set many different sums in addition and subtraction. Pupils in a class would probably have used slates to do the sums.

     
    Klein bottle, 1995.

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