Geometry instruments

Geometry instruments

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Caption: Assortment of geometry instruments; two pairs of compasses (used for drawing circles), a protractor (centre, for measuring angles), set square and ruler. When photographed through cross polarised light with a yellow filter, coloured patterns are seen on the plastic instruments. These indicate stress patterns, with areas of similar colour representing regions under similar degrees of stress. This phenomenon, known as photoelasticity, is applied in engineering design where a transparent plastic model with loads proportional to a real object may be made to determine stress conditions in the real object.

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Keywords: compasses, geometry instruments, mathematical, mathematics, maths, photoelasticity, protractor, set square

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