Patent for a new and improved drill. This design consists in "the combination, with the main shaft carrying two bevel gear-wheels, of a shaft carrying a bevel gear-wheel adapted to be connected alternately with the two bevel gear-wheels on said main shaft, a pinion secured on the said shaft, and a disk provided with a bevel gear-wheel meshing in the said pinion, said disk being connected with the drilling-tool, so that the latter can move freely up and down, but is turned by the said disk" (lines 111-120).