Fig. 536
Fig. 537
Fig. 538
Fig. 539
Cut four strips of thin cardboard 5½ inches by 1¼ inches; mark off ¼ inch for flanges; cut each as in Fig. 537; bend them round and fasten together; glue the smaller balls, B, B, into them and glue them on the roof just over the smaller circles.
Cut four strips of cardboard 5 inches by 1 inch; cut and mark as in Fig. 537, and glue this round the smallest balls, C. Measure distances ha, ab, bc, cd, etc. (Fig. 535), on a piece of cardboard, and mark out as in Fig. 538. Make half cuts along the dotted lines and leave flanges as shown. Distance ak = ah and lb = bc = cm = nd.