in the same scale. This idea can be more clearly shown by means of a simple model very easily made for the purpose. Take, for example, three pieces of standard red paper, 4x4 inches, and mount them on a piece of cardboard side by side, in a row. Trim the card parallel to the edges of the papers,… … Fig. 16. Fig. 16 which represents the model as seen by the class. By holding one of the rear edges with each hand the faces can be folded to different angles with each other and the model turned to different positions with relation to the children. Possibly the windows at the rear of the room may…
Color
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
