How the Panorama Box
is built. There are two holes bored through the top board and through the upper bottom board, but not through the lower bottom board. A glance at the diagram will show you that there are two bottom boards, fitting closely together.
Fig. 301.—The Panorama Box.
Before putting the panorama box together bore holes in the top board, at equal distances from the ends, and as near the front edge as you can conveniently bore them without danger of splitting the board. These holes are for the rollers, and should be of sufficient size to allow the rollers to revolve with little friction. In case you have no bit or auger which will make large holes, Fig. 302 shows how the difficulty may be overcome with a small bit, gimlet, or red-hot poker, by boring a number of small holes in a circle and then breaking out the centre-piece of wood; smoothing the inside with a sharp knife. In order that the holes in the bottom board shall be directly under those in the top, nail the bottom board to the top board with three wire nails, driving them in only just far enough to hold the boards together while the holes are being bored, as shown in Fig. 303. Since the