Fig. 9
Fig. 10
Now you can paint your picture, and while that is drying take one of your circular glasses and fit a rim—made of thin brass plate, a sixteenth of an inch thick—to it. This rim is to fit the glass tightly, and is to be a quarter of an inch wide; the ends are to lap a little, and are to be soldered together. Now cut from the same brass plate a strip two and a half inches long and a quarter of an inch wide, and solder this on to the rim, as in [Fig. 9]. Fix the circular glass in this rim, and on the inside paint the board and children on it, put it in its place in the circular hollow in the frame, and fasten it in its place with small pins pressed into the wood and bent over the brass rim ([Fig. 10]). By raising or lowering the lever the board will rock up or down.
Rack slides are very like the last description of slide, but in these the movable glass is capable of being moved quite round by a rack-and-pinion work.
IV. Revolving Slides for the Magic-Lantern, without Rack-work.
By F. Chasemore.
In my last section on magic-lantern slides, I mentioned that, although the frames for rack-work slides could be purchased, they were expensive. I have since then thought that the old-fashioned way of turning the revolving part—viz., by pulley and band—would be easy for boys to make, and answer very well if the cord is kept tight. In this section I give instructions in making these frames.
Fig 1
Make the outside frames five inches wide and ten inches long, out of wood half an inch by three-eighths, put edgeways. Cut a piece of thin deal or mahogany three-eighths of an inch thick and five inches square, and glue this on one side of half the frame (as [Fig. 1]). Cover the other half with a piece of glass four and a half inches square, and fasten it there with strips of deal, making them flush with the board on the other half. Glue corner-pieces (as in [Fig. 4]) on the other side of the glass, turning the frame over.