E/MJ : engineering and mining journal . FIG. 2 MINER WITH SINGLE-JACK AND STEEL involved in the primitive method of single-jack andsteel. There is no questioning the debt which the miningindusti-y owes to the invention of the reciprocatingtype of rock drill, but it remained for a Westernman, Mr. Leyner, born and raised amidst the hustleand bustle of the mining camps of Colorado, to takea real scientific step forwaid in the art of drilling 678 Engineering and Mining Journal Vol. 108, No, 17. Suliivan ,. ,_,.Rotaior NcKiema/z- rerryj?otafor jg GENERAL TYPES OF POWER ROCK DRILLS AND PARTS—L Fig.
E/MJ : engineering and mining journal . FIG. 2 MINER WITH SINGLE-JACK AND STEEL involved in the primitive method of single-jack andsteel. There is no questioning the debt which the miningindusti-y owes to the invention of the reciprocatingtype of rock drill, but it remained for a Westernman, Mr. Leyner, born and raised amidst the hustleand bustle of the mining camps of Colorado, to takea real scientific step forwaid in the art of drilling 678 Engineering and Mining Journal Vol. 108, No, 17. Suliivan ,. ,_,.Rotaior NcKiema/z- rerryj?otafor jg GENERAL TYPES OF POWER ROCK DRILLS AND PARTS—L Fig. 3—The Couch Rock Drill, the first power rock drill. Fig. 4—Fowles First Rock Drill. Fig. 6—Leyners First Shop. Fig. 6—The First Self-Rotating Hand Hammer Drill. Fig. 7—The Burleigh Drill. Fig. 3—The First Weod Drill. Fig. 9—The Ingersoll Drill. Fig. 10—The Rand Little Giant. Fig. 11—Cross Section Rand Little Giant. Fig. 12—Side Rod Construction of Modern Drills. Fig. 13—Ingersoll Eclipse Drill, withAir-thiown Valve. Fig. 14—The Rand Slugger Rock Drill. Fig. 16—Modem Valve Actions of the Piston or Spool Type. October 25, 191. Engineering and Mining Journal 679 rock. It is not necessary to dilate at length uponthe things he accomplished in the invention and de-velopment of the hammer drill—the introduction ofwater and air through hollow drill steel for cleaningthe hole, automatic lubrication, enclosed-in-the-ma-chine throttle control, mechanical rifle-bar
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
