The principles of architecture, containing the fundamental rules of the art, in geometry, arithmetic, & mensuration, with the application of those rules to practice, the true method of drawing the ichnography and orthography of objects, geometrical rules for shadows, also the five orders of architecture : with a great variety of beautiful examples, selected from the antique, and many useful and elegant ornaments, with rules for projecting them
A 1809 London architectural treatise by Peter Nicholson, with plates by Wilson Lowry and others, printed for J. Barfield and T. Gardiner as a manual of geometry, mensuration and the five orders for builders and students. Its plates are line-engraved geometric constructions, showing circles, polygons, arcs and ruled projections labelled with capital letters, with clean hairline drawing that a designer could use for proportional layouts, grid structures or diagrammatic ornament.
