Hand drill

A hand drill is the simplest primitive method to produce rapid rotary motion of a rod.

It consists in holding the rod vertically between both hands and moving these back and forth, in opposite directions, as in rubbing them.

The rod typically is one or two feet long and half an inch in diameter.

As a result, the hands drift down the rod, and must be periodically raised to the top again.

However, skilled operators can either maintain pressure with their hands almost stationary vertically; or, in a movement comparable to floating, can "float" their hands back to the top of the drill.