London. Alexander Hogg. Circa 1780s.
THREE copperplate engravings on laid paper, 14 x 8 1/2 inches on sheets 16 1/2 x 10 1/4 inches, accompanied by nine text sheets. Sheets have been disbound from a larger volume. Binding holes to left margins, well outside image area; 1/2 tear to bottom edge of one text sheet; occasional foxing and toning; overall very good condition. Includes "The Science of Geometry" (Plate 99) and "System of Geometry" (Plates 100 and 101). The delicate diagrams show angles within various shapes, as well as ways of measuring height and tools for measuring. The text (pages 1033 - 1050) explains the diagrams and provides mathematical equations. A beautiful scientific document. Item #55986