spring pole (spring pol)

A pole fastened so that its elasticity can be used for some mechanical purpose. - Spring-pole drilling, a method of boring holes in rock for oil, water, or any other purpose, in which the rods and drill are suspended from a spring. pole, which by its elasticity lifts them up after every stroke. The down motion is effected by hand-power, or sometimes a stirrup is added to enable the driller to use his feet. Prospecting-holes of from two to three inches in diameter can be bored with this simple apparatus to the depth of one or two hundred feet, or even more.