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Preparing the circle pen for use 38 The shape for circle pen points 38 Shaping circle pens for very small circles 39 A form of pen point recently introduced; forming the pen point 39 The method of oil-stoning circle pen points 40 The needle point and pen point 42 How to use the circle pen 43 German instrument to avoid slipping of a needle point 44 How to use the lining pen 45 Applying the ink to the bow-pen 46 Using a straight line or lining pen with a T square 47

CHAPTER III.

LINES AND CURVES.

Explanation of simple geometrical terms; radius; explanation of conventional dotted lines 48 A line at a right angle to another; a point; parallel lines 49 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 50 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 51 To find the centre from which an arc of a circle has been struck; the degrees of a circle 52 The protractor 53 To find the angle of one line to another 54 To find the angles of three lines one to the other 55 Acute angles and obtuse angles 57 Triangles; right angle triangle; obtuse angle triangle; equilateral triangle; isosceles triangle 58 Scalene triangle; a quadrangle; quadrilateral or tetragon 59 Rhomboid; trapezoid; trapezium 60 The construction of polygons 61 The names of regular polygons 62 The angles of regular polygons; the ellipse 63 Form of a true ellipse 69 The use of a trammel for drawing an ellipse 72 To draw a parabola mechanically 73 To draw a parabola by lines 74 To draw a heart cam public@vhost@g@gutenberg@html@files@23319@[email protected]#page75"