It was limited to a shaft running the length of the building.

This shaft runs about 50 yards into the side of the ledge.

From each corner of the motor, a shaft ran to a wheel.

Inside was a huge, cylindrical shaft running up and down hundreds of meters.

On the left at a distance, the eastward shaft ran equally straight.

A shaft runs through the length of the handle.

Just a shaft running back to the rear differential.

The shafts generally ran at an angle of 22-22.5 degrees to follow the vein.

Running through the middle of the drums are two separate shafts, for input and output.

Twelve vertical shafts run between the ground and the aqueduct.