All are cause and effect, and they fit into one another like cog wheels.
The crank and cog wheels employed to produce high speed are not shown in the figure.
When a man tries to stop a great machine by putting his impudent fingers into the cog wheels, the man's a fool.
In this the pistons consisted of two cog wheels, their leaves intermeshing, and rotated in an elliptical shaped chamber.
The principal care needed by these devices is that they be kept clean and the cog wheels dry.