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Updated: May 26, 2025
There was some trouble with a rival firm, which also bid, but we secured the contract, and bound ourselves to have the tunnel finished within a certain time, or forfeit a large sum. "That was over a year ago. Since then our men, aided by the native Indians of Peru, have been tunneling the mountain, until, about a month back, we struck a snag." "What sort of snag?" Tom asked.
"The orders is to stay right here for the night," said the Orderly-Sergeant, coming up through the brush to Si, "and be ready for anything that comes. I don't know what old Sherman means whether he is going to send over some balloons to lift us to the top of the rocks, or set us to tunneling through. I suppose it ain't my business to know. I've got enough to do running this company.
The "Fire-setting" method of tunneling was originated by them, and they also developed the familiar principle of prosecuting the work at several points at the same time by means of vertical shafts. They heated the rock to be excavated by great fires built against the face of it.
In the case of solid rock the work is slow but simple; dry, hard, firm earth is much the same as rock. The difficulties of tunneling lie in the soft ground, subaqueous mud, silt, quicksand, or any treacherous soil of a shifting, unsteady composition. When the rock is to be removed it is customary to begin the work in sections of which there may be seven or eight.
His ways are much the same as those of Miner whom you have just met, excepting that when he is tunneling deep in the ground he pushes the earth to the surface after the manner of Grubby Gopher, and his mounds become a nuisance to farmers. When he is tunneling just under the surface he makes ridges exactly like these of his eastern cousin.
The ancient Egyptians besides the hammer, chisel and wedges had tube drills and saws provided with cutting edges of corundum or other hard gritty material. For centuries there was no progress in the art of tunneling. On the contrary there was a decline from the earlier construction until late in the 17th century when gunpowder came into use as an explosive in blasting rock.
There was a feel in the air now that told him it was far past the turn of night. He knew about where they were in relation to the ranch by this time, for a man who lives in the open places develops his sense of direction until it serves him as a mole's in its underground tunneling.
And with every breath we drew, waking or sleeping, we realized that the cold blooded, inhuman invaders had crept a fraction of an inch closer in their tunneling. The Quabos against the Zyobites! Fish against man! Two diametrically opposed species of life in a struggle to the death! Which of us would survive? The hour of the struggle approached.
Of course James Henry Greathead very materially improved the shield, so much so indeed that the present system of tunneling by means of circular shields is called the Greathead not the Barlow system. Greathead and Barlow entered into a partnership in 1869.
In many places the hostile trenches were separated by only a few yards, and mining was frequently resorted to. Tunneling toward each other, both the contending forces occasionally succeeded in blowing up the enemy's trench, and whole companies of unsuspecting troops were sometimes annihilated in this way. In the trenches themselves scenes unparalleled in warfare were witnessed.
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