The Elements of Mining And Quarrying
The Elements of Mining And Quarrying
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, 1899, p. 437. T Heise, op. Cit. T p. 440.
EXCAVATION.
69 >;--.
FIGS. 66 and 67. Electric Medium Tension Glow Fuse.
m a FIGS. 68 and 69. Electric Low Tension Time Fuse.
70 THE ELEMENTS OF MINING AND QUARRYING.
in fact, he regulates the position and depth of each hole according to the particular circumstances of the case.
Though a vein and its walls may be hard, there is occasionally a soft layer of clay (D D, DD, fig. 71) along one wall (dig, Cornwall ; gouge, U. S. ). The miner works this awa...y with the pick, and, after having excavated the groove as deep as possible, blasts down the lode by side holes, and so pushes the level forward.
In sinking a shaft a similar method of proceeding is adopted. A little pit (sink) is blasted out in the most convenient part, and the excavation is widened to the full size by a succession of blasts, FIG. 70. Arrangement of holes for driving a level by hand labour.
FIG. 71. Driving a level where there is a clay selvage.
each hole being planned according to circumstances.
What to read after The Elements of Mining And Quarrying?
You can find similar books in the "Read Also" column, or choose other free books by Clement Le Neve Foster to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
, 1899, p. 437. T Heise, op. Cit. T p. 440.
EXCAVATION.
69 >;--.
FIGS. 66 and 67. Electric Medium Tension Glow Fuse.
m a FIGS. 68 and 69. Electric Low Tension Time Fuse.
70 THE ELEMENTS OF MINING AND QUARRYING.
in fact, he regulates the position and depth of each hole according to the particular circumstances of the case.
Though a vein and its walls may be hard, there is occasionally a soft layer of clay (D D, DD, fig. 71) along one wall (dig, Cornwall ; gouge, U. S. ). The miner works this awa...y with the pick, and, after having excavated the groove as deep as possible, blasts down the lode by side holes, and so pushes the level forward.
In sinking a shaft a similar method of proceeding is adopted. A little pit (sink) is blasted out in the most convenient part, and the excavation is widened to the full size by a succession of blasts, FIG. 70. Arrangement of holes for driving a level by hand labour.
FIG. 71. Driving a level where there is a clay selvage.
each hole being planned according to circumstances.
What to read after The Elements of Mining And Quarrying?
You can find similar books in the "Read Also" column, or choose other free books by Clement Le Neve Foster to read onlineMoreLess
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