The next kind of machine, which miners employ when the shaft is
deeper, differs from the first in that it possesses a wheel as well as cranks.
This windlass, if the load is not being drawn up from a great depth, is turned
by one windlass man, the wheel taking the place of the other man. But if the
depth is greater, then the windlass is turned by three men, the wheel being
substituted for a fourth, because the barrel having been once set in motion,
the rapid revolutions of the wheel help, and it can be turned more easily.
Sometimes masses of lead are hung on to this wheel, or are fastened to the
spokes, in order that when it is turned they depress the spokes by their weight
and increase the motion ; some persons for the same reason fasten into the
barrel two, three, or four iron rods, and weight their ends with lumps of lead.
The windlass wheel differs from the wheel of a carriage and from the one
