On January 8, 1851, construction began on a 4.75-mile-long railroad tunnel, at the time the longest in North America and second-longest in the world, under Hoosac Mountain in Massachusetts. To tunnel ...

Initial drilling activities commenced on 20 November 2012 and 15 percussion holes completed before year-end. This release reports on an additional 30 percussion drill holes completed in Q1 2013.

Varel International, a leading manufacturer of drill bits and global supplier to the industry, has signed a letter of intent to acquire the Rotary Percussion System (RPS) product line and assets ...

In 1849, Jonathan J. Couch had patented the world’s first percussion rock drill. The drill steel passed through a piston. The steel was launched by steam like a lance, seized in a gripper box on the ...