Compressed Air Drill an earsplitting drill that can rip through rock with ease First used in a tunnel in 1866, in the Hoosac Tunnel, in North Adams, Massachusetts

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The compressed air drill made life much easier for workers in the Hoosac Tunnel. The drill was safe and three times more effective than gunpowder. In the choking dust, the drills also had a welcome side effect. Air blew out of the end of the drills and actually provided some fresh air in the stuffy Hoosac Tunnel. Before the compressed air drill, workers toiled in hot, steamy tunnels without any ventilation!

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