Some spits were mechanized with a cogged wheel and a weight at the end of a string.

The cogged wheel in Fig.

But one can make a cogged wheel out of whatever one will-andbeside, a magnet only influences certain substances.

This cogged wheel, Fig.

But even as he spoke there grated harshly the creak of rusty chains on a cogged wheel, the rattle of a brake.

Two cogged wheels turning in opposite directions fit into each other, and grind out a resultant motion, different from either of theirs.

It was about thirty feet long, by ten in breadth, rode on four broad cogged wheels, and was set on strong, flexible springs.

Both plate and shutter are revolved in opposite directions to each other by a simple arrangement of four cogged wheels moved by a single crank.