The Optical Magic Lantern Journal (January 1901)

4 The Optical Magic Lantern Journal and Photographic Enlarger. F is the long rod by which the movements of the parts are regulated. It works in a slot (x) cut in the end of the framework ; this rod is pivoted to the wooden base by a screw (3). Two thin rods are pivoted to this rod at H, H, and to the arms of the figures at a, G. The shape of the arms 4, A, will be noticed and the spoons must not be forgotten. The arms are pivoted to the base at the points _ marked p, D. Two long thin rods oc, c, are pivoted to the arms and connect them to the parts B, B, to which they are also pivoted in the positions indicated by black dots. The jaw-bones 8, B, with their peculiar, hammer-shaped projections, the use of which will be revealed presently when the slide is The proper relation between the size of the parts and the distances from each other at which they are pivoted must be carefully kept, or the slide will be of no practical utility. For instance, were the arm of either figure to be made too long, it would rise from a point owtside the basin and go right up to the nose, producing a most absurd effect. Equally ludicrous would be the sight of the arm being carried up to a point a few inches from the mouth, and there stopping, only to be repeatedly lowered and raised in fruitless endeavours to carry the spoon with its contents to the mouth. Thése words of warning are by no means unnecessary. Very careful attention must be paid to the completed, are pivoted to the base at 5, EF, and | correct construction of this part of the slide. as before mentioned, are connected to the arms by the rods ¢, c. When the construction and fitting of the working parts is completed, a few lines representing the interior of a room are sketched on the fixed glass, as illustrated in the diagram. If desired or thought necessary, the working parts may be protected by the employment of the cover-glass mentioned at the beginning. The slide is now completed, but before we notice what: effect is produced by the movement of the extending rod or lever Fr, the reader will do well to pay particular attention to the following words of caution :—Unless all the working parts have been most accurately shaped and adjusted, the slide will fail in its object of representing ‘‘ Punch and Judy Dining.” A reference to the diagram will be a great help to the reader, but, after all, the best way to ensure accuracy is to experiment with pieces of cardboard. We will now consider what happens when the rod F is raised and lowered. When it is lowered, as in the diagram, the rod regulating the arm of Judy will be pulled down, thus causing the arm, which is pivoted at bv, to be raised from the basin to the mouth. The rod connecting the arm to =) the jaw-bone will also be raised, causing the jaw-bone and the peculiar hammer-like projection to be lowered. The effect of this movement will be to open the mouth for the reception of the contents of the spoon and to partially close the eye. This partial closing of the eye will appear on the screen to be due to the person glancing down at the spoon. Now, at the same instant as these actions are taking place, Punch’s arm will be lowered by the raising of the rod which connects it to the lever Fr; he will thus be seen dipping his spoon for another supply to carry to his mouth, when the rod is raised. At the same time, by the action of the other connecting rod, the jaw will be shut and the eye again opened in exactly the same way as a person does when eating. ; The raising of the rod reverses these actions ; Judy will be obtaining another supply and Punch will be eating his portion, as represented | in the heading.