Sentence Examples


  • The earliest communications were carried on by means of "raps," or, as Sir William Crookes calls them, "percussive sounds."
  • Another class of percussive coal-cutters of American origin is represented by the Harrison, Sullivan and Ingersoll-Sergeant machines, which are essentially large rock-drills without turning gear for the cutting tool, and mounted upon a pair of wheels placed so as to allow the tool to work on a forward slope.
 
 

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