What I find interesting is that in Figure 114, they were able to create a "back and forth" linear motion by just removing the right number of teeth on the gear. Basically, the little "pinion" only acts on one side of the rack at a time, which forces entire rack to move in one direction, rectilinearly. Then when it runs through the entire side of one rack in less than a full revolution, it starts acting on the other side of the rack, and forces the entire rack to move in the opposite direction.
In contrast, Figure 115 uses two pinions to help move a larger rack at once. While I can't quite picture what 115 does when it reaches the end of the rack...But I do see how it would drive the rack with equal force and velocity on both sides, which seems more reliable than just having one side being push/pulled by the mutilated pinion in Fig. 114!
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