A Plane is a level. Place one die upon another, and together they make a prism, cut by a plane where the separation between the dice is.
25. Make a six sided prim, and double it by
lengthening it. (fig. 19.)
When one die is put upon another, the first die is doubled in length.
26. Make a jive sided prism, and cut it by three planes parallel to its base.
A long prism may be drawn and cut as in Prop. 24, or a short prism be first made and lengthened as many times as you please.
27. Draw a Jive sided prism in a horizontal position. (fig. 20.) Cut it by a plane parallel to its base.
THIRD CLASS.
(1)
(2)
1. Describe a circle and mark its centre, (fig. 1.)
By constant practice the pupil will be able to draw a circle, and mark its centre with great exactness. The monitor with a pair of dividers will prove it. The pu- pils in the Monitorial School have various methods of marking circles, without the aid of dividers, the most
