‘The Fuller Calculator’ (1945): a long-scale cylindrical slide rule which consists of a cylinder which can be rotated and moved up and down around an inner cylinder held by a handle and is provided with three brass pointers or indexes. The logarithmic scale is arranged spirally on the outer cylinder and is the equivalent of a straight scale of 500 inches making it possible to obtain four figure accuracy in a result. Besides the operations of multiplication and division, results requiring reciprocals, powers, roots or logarithms of numbers can be obtained. The wooden case also acts as a support when the instrument is in use.
The ‘Fuller Calculator’ was patented by George Fuller MICE in 1878.