Guide

a b c acroſs alfo alſo angle rib axis bafe baſe beam becauſe bevel bifect body ribs centre chord circle circular wall compaſs confequently correfponding curve cylinder defcribe diameter diſtance divide divifions dome draw a line draw lines draw the line drawn edge ellipfis elliptic face mould falling mould fame manner fcroll fection fegment femicircle fhall fhewn fide arches figure fimilar firſt foffit fquare front rib ftand fteps ftraight ftretch given groin half height hyperbola inches infide interfecting lines jack ribs laft laſt plate length likewiſe mitre muſt number of equal obferve ordinates parabola parallel lines parallelogram perpendicular piece of timber pitch-board plane plank polygon pricked purline radius rail rake right angles right line roof round ſame ſet ſhall ſky-light ſquare ſtand ſteps ſtrength Suppoſe thefe theſe points thickneſs traced triangle uſed width