CHAPTER I.
The Tools, Machines, and other Appliances used in Rock Blasting. |
| PAGE |
| Section I. Hand-boring Tools.—Drills. Hammers. Auxiliary Tools. Sets of Blasting Gear | 1 |
| Section II. Machine-boring Tools.—Machine Rock-drills. Borer-bits. Drill Carriages | 23 |
| Section III. Appliances for firing Blasting Charges.—Squibs. Safety Fuse. Electric Fuses. Cables. Detonators. Electric Firing-Machines | 42 |
CHAPTER II.
Explosive Agents used in Rock Blasting. |
| Section I. Phenomena accompanying an Explosion.—Nature of an Explosion. Heat liberated by an Explosion. Gases generated by an Explosion. Force developed by an Explosion | 64 |
| Section II. Nature of Explosive Agents.—Mechanical Mixtures. Chemical Compounds | 76 |
| Section III. Relative Strength of the common Explosive Agents.—Force developed by Gunpowder. Relative Force developed by Gunpowder, Gun-cotton, and Nitro-Glycerine | 88 |
| Section IV. Means of firing the common Explosive Agents.—Action of Heat. Detonation | 92 |
| Section V. Some Properties of the common Explosive Agents.—Gunpowder, Gun-cotton, Dynamite. Firing Temperatures | 97 |
| Section VI. Some Varieties of the Nitro-Cellulose and the Nitro-Glycerine Compounds.—Nitrated Gun-cotton. Tonite, or Cotton-Powder. Schultze’s Powder. Lithofracteur. Brain’s Powder. Cellulose-Dynamite | 103 |
CHAPTER III.
The Principles of Rock Blasting. |
| Line of least Resistance. Force required to cause Disruption. Conditions of Disruption. Example of a Heading. Economical Considerations. Tamping | 106 |
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 |
CHAPTER V.
Subaqueous Blasting. |
| Preparation of the Charge. Boring under Water. Submarine Rocks. Obstructions in Water-courses | 164 |
