Another major complaint was the one-man drill. In a system of hard-rock mining inherited from Cornish mines, miners drilled blast holes in a three-man team. One man held a steel drill, while two other men took turns hitting the steel with sledgehammers. Mines began to look for improvements to this system as early as the 1870s. The first improvement came with the "two man drill", which was a mechanical drill operated by compressed air. This drill was much more efficient than the three-man system, but still required two men to set up and operate. In addition, some mines allowed three men to work on the drill. As a result, the changeover from the three-man system to the two-man drill was relatively smooth.
