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THE TRICK PICTURE 117 CHAPTER XVIIL THE TRICK PICTURE Limited demand for the trick picture story—basis of trick work—stop camera—back turning—accelerated speed— double exposure—double printing. The trick picture as such is in such slight demand that it will not pay to write this class of stories except on a positive order. Trick work is both tedious and expensive and unless exceptional- ly well done is not in great demand. An idea of how trick work is done will help the author to understand how certain effects may be gained in straight dramatic stories, but it should be un- derstood that this chapter is for the information of the author and not to enable him to explain to the director how the effect may be gained. There is a common belief that "anything is possible to the camera through trick work" and that statement is entirely true, but it should be qualified by the additional fact that many of these trick methods will give a cost far in excess of the benefit qf the effect gained, and so, while the effect is possible, it is not practicable to do the trick work required. The basis of most trick work is stop camera, double exposure, double printing trick turning, or stopping down. Stop camera is just what the term implies, a stoppage of the camera. For this a special gear is used, giving one picture to every turn of the crank. This makes it possible to take but a sin- ^gle picture and yet be certain that the lense is covered, which is not possible where the usual sixteen to the second handle is em- ployed. Some cameras use the four to one, attachment, which means that one picture is taken at the regular speed every quarter second. This device is employed where the familiar doll drama is used in which dolls seem to perform the actions of the drama instead of players of flesh and blood. After each exposure the positions of the hands and legs are changed in the same degree that a film shows the limbs of regular players to move. If it takes four frames to show the downward movement of an arm, it requires four exposures and four changes to get the same effect with the doll. When the .film is run off the action appears continuous.