SECTION XXIV. The circular Line. The mother draws before the child a circle, and says, this line, pointing to 5, is called a circular line; and the interior space, pointing to a, a circle. Mother. Can you draw a circular line? Draw four circular lines. The drawing these lines must be practised from right to left, and from left to right. The mother makes a point in the middle of the circle, saying, this point is called the centre of the circle. Draw a circular line, and try to find the centre. SECTION XXV. The Curve Line or Arch. Mother. This line is called a curve. Draw three, four, &c. curves or arches. The mother, pointing to b, says, ^-^r-v^ this is the convex, and pointing to a, this is the concave side of the curve or arch. Show me the convex side. Can you point out the concave side? D SECTION XXVI. Mother. Can you draw two circular parallel lines? If the child cannot do it, the mother draws them. Draw two parallel curves or arches; three not parallel curves; three parallel, and two not parallel curves, &c. ve is CLs SECTION XXVII. The mother draws the two angles, a and b, saying, the angle a is formed of two concave sides, and is called a concave angle: b formed of two convex sides, and is called a convex angle. The third is composed of a convex and a concave side, and is therefore called a mixed angle. Draw concave, convex, and mixed angles. Draw three concave, four convex, and two mixed angles. Represent every thing you know of the circular line on your slate. |