First, we brainstormed what was inside the toy and made a preliminary drawing. Then we sacrificed the dolphin for science to actually determine what was inside. Next, we modified our original diagram to reflect the actual mechanism. Both the preliminary and final mechanisms were presented.
There was actually an intermediate gear between the shaft attached to the turning key and the bevel gear, and some of the gears had two stages to adjust speed. Otherwise, our original hypothesis was accurate.
