Rock Blasting A Practical Treatise on the Means Employed in Blasting Rocks for Industrial Purposes
CHAPTER IV.
THE OPERATIONS OF ROCK BLASTING.
_Hand Boring._--Boring the Shot-holes. Charging the Shot-holes. Firing the Charges 128
_Machine Boring._--Boring the Shot-holes. Charging and Firing. Removing the dislodged Rock. Division of Labour 142
_Examples of Drivings._--The St. Gothard Tunnel. The Hoosac Tunnel. The Musconetcong Tunnel. Headings at Marihaye, Anzin, and Ronchamp 157