The carpenter's new guide [electronic resource] : being a complete book of lines for carpentry and joinery, treating fully on practical geometry, soffits, brick and plaister groins, niches of every description, sky-lights, lines for roofs and domes, with a great variety of designs for roofs, trussed girders, floors, domes, bridges, &c. ... / well explained and fully exemplified on seventy-eight copper-plates, correctly engraved by the author, including some observations and calculations on the strength of timber, by Peter Nicholson