What is "cog wheel"

Usage examples of "cog wheel".

So I made a cog wheel or gear out of a disc of oak by putting pegs around the edge.

Through that he could see the lights of emergency vehicles, dozens of them, it looked like, and above the creaking of the cog wheel he could still hear the concert of wailing sirens.

The teeth of the big cog wheel disintegrated into a brown powder at the touch of my fingers.

And then in the foreground, halfway between us and the dam I noticed a big rusty cog wheel and some rotten baulks of timber bolted together in an upright position.

As she approached the great black ship steam hissed into the engine beneath the turret, turning the cog wheel that meshed with the gear under the base.

As she turned back toward the water, she saw a circle of gold turning in the shallows, a shiny cog wheel like those that turn endlessly in the backs of watches or the workings of music boxes, and beyond the wheel, deeper in the water, a larger wheel, and another deeper yet.