Calculating machine invented by Sir Samuel Morland, adapted to trigonometrical computation with wooden case. Made by Henry Sutton and Samuel Knibb, London, 1664.

This machine was used to simplify calculations involving triangles, using a mathematical

technique known as trigonometry. Surveyors rely extensively on this practice as it enables

huge areas to be surveyed using the lengths and angles of triangles.

The operator used the machine by ‘drawing’ the problem on it. It contained three rules

which could be moved using dials to make a triangle of the required size. Angles or lengths

could then be read off directly. However, it was expensive and did not catch on.