ManuscriptVellum-bound handwritten mathematical notebook dated from 1797 to 1799. Written in a very meticulous hand by G. Firth, a young student who attended Butterwick School in the county of Lincolnshire. The notebook contains about 85 handwritten pages of calculations; the student has carefully divided the text under attractively written titles and made calculations on how to find the "solidity," "surface area," "algebraic fraction," and other calculations of geometric shapes, including how "to find the diameter of the globe of the Earth." The student neatly draws three-dimensional "prisms," "cylinders," "cones," a "triangular pyramid," a "hexagonal pyramid," and calculates how "to find the solidity of the wedge," "the solidity of a prismoid," "the convex surface of a sphere or globe," and the "solidity of a spherical segment" . He adds many detailed, finely drawn geometric three-dimensional diagrams including of such unusual shapes as a "degadron" and an "icosahedron," with handwritten example problems and explanation of the rules for each. Each chapter is headed by a handwritten title in fine large calligraphy, with a written explanation of the concept beneath. Light staining to white vellum covers as expected, but over all remarkably clean and strong for its age. Floral illustration in red and navy on edges. A very fine example of an early student's calculation book. Finally, inserted between pages 132 an 133, a carefully hand-colored plate on vellum of a pink flower that looks to be a carnation.