Fourth Series, Bulletin Volume A A 4-5

Fourth Series, Bulletin Volume A A 4-5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...bit. The operator stands up straight, and sinks the hole by raising and dropping the drill, turning it part of a revolution with each stroke. The workman does not seem to put much effort in the downward or driving stroke. The main energy expended seems to be in lifting the drill up for successive strokes. In the Corniferous and Waterlime (Monroe) belts, the bedding of the stone is much tighter, and more vigorous methods are necessary for the economic winning of the stone. In these formations but few quarries are operated for building stone alone, and as a rule compressed air or steam drills are available for the heavier work. In some cases in the Waterlime, as at Greenfield, pop shots are resorted to to open up working faces, since the bedding is exceptionally tight at this point. Also the stone makes a good lime, and hence there is no waste occasioned by the spalls from these shots. This quarry is among those using modern equipment, and as may be seen from the table at close of this chapter, it is one of the larger producers of building stone in the state. The great majority of the output credited to Highland county comes from this point. The drilling is chiefly done with a tool known as the quarry bar. It is is an ordinary steam or compressed air drilling machine mounted on a horizontal rod, or bar, so that any number of holes may be put in in a straight line covering the length of this supporting rod at one setting without shifting the mounting of the drill or drills. The Miami Stone Company operating in Lucas county, between White House and Waterville, is using another modern implement in disengaging the stone, viz: a channeling machine. This type of machine is much used for the quarrying of oolitic limestone in Indiana, in more

Product details

  • Paperback | 150 pages
  • 189 x 246 x 8mm | 281g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236633873
  • 9781236633873