MANUSCRIPT. – Thomas WHITEHEAD. [A hand-written student’s book of geometrical exercises and problems. N.p.:] 1806. 159pp., manuscript, 4to (231 x 187mm.) Numerous problems, proofs, exercises relating to geometry in a single, legible and calligraphic hand, numerous hand-drawn diagrams. (Toning.) Contemporary calf-backed marbled paper-covered boards (some loss to spine ends). Note: with considerable detail in the text relating to geometrical problems, including ‘Of the Slide Rule’, ‘Of the Use of the Cube Root’, ‘Definitions of a Circle and some of its properties and the relation they bear each other’, ‘Of Inverse Proportion, or the Single Rule of three indirect by the Lines A and B’, while occasionally the tone is a little sardonic: ‘Another Method, nearly true’, and ‘Another method, still nearer’. – And another two manuscripts (Edmund Whitehead’s 37pp. book of hand-writing exercises in a calligraphic hand, [disbound], 1788, and an 8pp. volume of mathematical exercises related to time, [circa 1800]) (3).