File:Mt Vernon Gristmill Gears.jpg
Gears for driving the mill stones. At left, background, is the "pit gear," the largest gear and the one connected directly to the water wheel. It connects to the smaller horizontally-mounted pegged gear (bottom, center) which is mounted coaxially on a shaft with the large toothed gear (right, background). The small, vertically-mounted pegged gear (right, top) connects to the grindstone above.