## An Elementary Treatise on Orthographic Projection: Being a New Method of Teaching the Science, of Mechanical and Engineering Drawing, Intended for the Instruction of Engineers, Architects, Builders, Smiths, Masons, and Bricklayers, and for the Use of Schools. With Numerous Illustrations on Wood and Steel |

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### Common terms and phrases

arrow axis base centre line cone conic sections cube curved line curved surface cylinder describe an arc direction indicated dotted lines draw a line draw lines parallel edge view eleva ellipse end elevation equal in length fall vertical lines find the elevation find the projection generatrix given angle given point graphic projection horizontal plane imaginary plane inclined plane intersecting line let fall vertical line a b line of penetration line of section line represented lines at right lines from points lower plane number of points object obtained original point orthographic projection plan and elevation plan of point plane of projection point or line points of intersection position Problem projecting rays projection of points represent a plan required to find right angles screw sectional elevation sectional plan semicircle set square shadow line shown sphere student supposed Theorem thickness thread tion upper face upper plane vertical plane