In straightforward to-and-fro movements, such as those of a piston or pendulum, it may or may not be possible to use the same drawings in the reverse order for the return movement. With a rigid pendulum (Fig. 49A) it would be possible, but with a cartoon piston (Fig. 49D) animated with steam pressure in mind, the drawings used for the forward movement would not work in reverse.
FIG 49A A straightforward swing cycle, in which the same drawings can be used for both directions of swing. B Flexible objects tend to swing more like this. C, D, and E Short repeat cycles in which the same in-betweens cannot be ...
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