main shaft

This gear meshes with one of 35 teeth upon a shaft at right angles to the main shaft and parallel to the axis of the aerodrome.

Once, in particular, I went down the main shaft in the dark, and gave a miner an awful fright.

Continuing to retrace their steps, Captain Dan and Oliver made for the main shaft.

Both of these joined the main shaft after describing an angle.

Mounted also on the main shaft is one of a pair of reversed cone drums.