Artesian Wells As a Means of Water Supply
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in diameter, and in i6ft. to 20ft. lengths. They have wrought-iron taper-screwed ends for coupling and uncoupling.
By using the "jar" below these poles the chisel, or bit, alone strikes the rock, the poles above it falling a less distance than the play or space between the upper and lower links of the jar.
Previous to the use of this arrangement the weight of the poles at great depths was an evil of serious importance, for when per- cussive motion was given to them they vibrated with great forc...e, and, striking against the sides of the bore, detached portions of loose rock which fell upon the top of the working chisel. As the bore is generally full of water from the upper springs, large light, but strong, wooden poles lose a great deal of their weight in the water, which is a desirable point, and the vibration, owing to their volume, is reduced to a minimum. Another important advantage in the use of the poles is that, from their rigidity, they admit of certain and trustworthy turning of the chisel at its work in the bottom of the bore-hole, a most important matter in the quick and safe execution of the work.
What to read after Artesian Wells As a Means of Water Supply?
You can find similar books in the "Read Also" column, or choose other free books by Walter Gibbons Cox to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
in diameter, and in i6ft. to 20ft. lengths. They have wrought-iron taper-screwed ends for coupling and uncoupling.
By using the "jar" below these poles the chisel, or bit, alone strikes the rock, the poles above it falling a less distance than the play or space between the upper and lower links of the jar.
Previous to the use of this arrangement the weight of the poles at great depths was an evil of serious importance, for when per- cussive motion was given to them they vibrated with great forc...e, and, striking against the sides of the bore, detached portions of loose rock which fell upon the top of the working chisel. As the bore is generally full of water from the upper springs, large light, but strong, wooden poles lose a great deal of their weight in the water, which is a desirable point, and the vibration, owing to their volume, is reduced to a minimum. Another important advantage in the use of the poles is that, from their rigidity, they admit of certain and trustworthy turning of the chisel at its work in the bottom of the bore-hole, a most important matter in the quick and safe execution of the work.
What to read after Artesian Wells As a Means of Water Supply?
You can find similar books in the "Read Also" column, or choose other free books by Walter Gibbons Cox to read onlineMoreLess
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