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line To bisect a given angle To draw a line parallel to a given line To draw an angle equal to a given angle To draw a line making an angle with a given line ... ... ... ... ... ... 23 27 viii CONTENTS PAGE CHAPTER V PLANE GEOMETRICAL FIGURES To construct an equilateral triangle, an isosceles triangle, a scalene triangle To construct a square, a rectangle, a rhombus, a rhomboid, a tra- pezium, a regular pentagon, a hexagon, a regular octagon CHAPTER VI ORTHOGRAPHIC PROJECTION The Planes of Projection The difference between a vertical and a per- pendicular plane The relative position of the planes of projection The projections of a point and a straight line The projections of a line inclined to the planes of projection ... ... ... 35 41 CHAPTER VII PROJECTION OF PLANE FIGURES The Projection of the Triangle The square The pentagon and the hexagon, etc. 42 46 CHAPTER VIII THE PROJECTION OF SOLIDS Definitions of the Plane Solids The cube, the prism, the pyramid, etc. Models of the Solids necessary to the Student for a thorough know- ledge of their projection Elevations of objects given to find their plans Meaning of section, side elevation, sectional plans and eleva- tions 47 58