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Updated: May 26, 2025
At all these times every precaution was taken to prevent any one getting out surreptitiously. This narrowed down the possibilities of passing the limits of the pen alive, to tunneling. This was also surrounded by almost insuperable difficulties. First, it required not less than fifty feet of subterranean excavation to get out, which was an enormous work with our limited means.
With great austerity Don Ramon pointed out that this trifling with the entrails of the earth was not only an indignity to Nature almost equal to shaft-sinking and tunneling, but was a disturbance of vested interests.
Bridge building, railroad building, the tunneling of mines -in a word, the building of any of the great works of industry possessed a huge fascination for them. Tom was good-natured and practical, Harry at times full of mischief and at others dreamy, but both longed with all their souls to place themselves some day in the front ranks among civil engineers.
Great strides in modern tunneling developed the "shield" and brought metal lining into service. The shield was invented and first used by Sir M. I. Brunel, a London engineer, in excavating the tunnel under the River Thames, begun in 1825 and finished in 1841.
At the end of the month the burrowing had been succeeded by tunneling, and both sides prepared for a winter of spasmodic action. It was a military deadlock, but a deadlock full of danger for the side that first developed a weak point in its far-flung front.
T.R. Cramton, who at the Southampton meeting of the British Association suggested a method of tunneling which, under certain conditions, seems of excellent promise, brought forward a suggestion at Southport for the construction of three-way tunnels. Now, the undoubted aim of all engineers is economy of construction and the securing of permanent advantages. Mr.
A deeper blackness enclosed us a tunneling. Through that we flowed. Out of it we darted into a widening filled with wan light drifting down through a pinnacle fanged mouth miles on high. Again the cleft shrunk. A thousand feet ahead was a crack, a narrowing of the cleft so small that hardly could a man pass through it. Abruptly the metal dragon halted.
If the first section attacked be at the top immediately beneath the arch of the proposed tunnel, next to the overlying matter, it is called a heading, but if the first cutting takes place at the bottom of the rock to form the base of the tunnel it is called a drift. Driving a heading is the most difficult operation of rock tunneling.
And, after all, it was seldom worth the gore and effort, for the trickle generally stopped altogether in August when they needed it. If the flow did not stop at the intake it broke out somewhere below and flooded somebody. If the sides did not give way because of the moisture loosening the soil, the rats and prairie dogs conspired to ruin Prouty by tunneling into the banks.
"He figured out a way of tunneling through this section here" he pointed to a particularly rugged section of the hills "at half the cost of bringing it straight in on that plain there." Connel and Walters studied the map closely. "Very good," said Walters. "You think you can do it, Dave?" asked Connel. "I'm sure I can, sir," replied the young man. "And save time?" growled Connel.
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