Chapter III. Lines and Curves

Explanation of simple geometrical terms; radius; explanation of conventional dotted lines

A line at a right angle to another; a point; parallel lines

A line produced; a line bisected; a line bounding a circle; an arc of a circle; segments of a circle; the chord of an arc; a quadrant of a circle

A sector of a circle; a line tangent to a circle; a semicircle; centre of a circle; axis of a cylinder; to draw a circle that shall pass through three given points

To find the centre from which an arc of a circle has been struck; the degrees of a circle

The protractor

To find the angle of one line to another

To find the angles of three lines one to the other

Acute angles and obtuse angles

Triangles; right angle triangle; obtuse angle triangle; equilateral triangle; isosceles triangle

Scalene triangle; a quadrangle; quadrilateral or tetragon

Rhomboid; trapezoid; trapezium

The construction of polygons

The names of regular polygons

The angles of regular polygons; the ellipse

Form of a true ellipse

The use of a trammel for drawing an ellipse

To draw a parabola mechanically

To draw a parabola by lines

To draw a heart cam