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Updated: June 15, 2025
But in places where this powder is not found, the following method must be employed. A cofferdam with double sides, composed of charred stakes fastened together with ties, should be constructed in the appointed place, and clay in wicker baskets made of swamp rushes should be packed in among the props.
Men living in the light, the supporters of the bridge as well as its enemies, knew very well that such an erection was quite unneeded, and would in all probability never be made. But then the firm of Blocks, Piles, and Cofferdam, who held a vast quantity of the bridge shares, and who were to be the contractors for building it, had an all-powerful influence in the borough of Limehouse.
Under this system a length of some two miles of quay wall is being constructed at Antwerp, far out in the channel of the river Scheldt. Here the caissons are laid end to end with each other, along the whole curve of the wall, and the masonry is built on the top of them within a floating cofferdam of very ingenious construction.
A few, still more eccentric and daring in their views, suggested that a huge cofferdam or vessel should be built on shore, and as much of the lighthouse built in this as would suffice to raise the building above the level of the highest tides; that then it should be floated off to its station on the rock, which should be previously prepared for its reception; that the cofferdam should be scuttled, and the ponderous mass of masonry, weighing perhaps 1000 tons, allowed to sink at once into its place!
Then, in the place previously determined, a cofferdam, with its sides formed of oaken stakes with ties between them, is to be driven down into the water and firmly propped there; then, the lower surface inside, under the water, must be levelled off and dredged, working from beams laid across; and finally, concrete from the mortar trough the stuff having been mixed as prescribed above must be heaped up until the empty space which was within the cofferdam is filled up by the wall.
Where would Mr. Nogo be if he did not cultivate the friendship of such men as Blocks, Piles, and Cofferdam? And so Mr. Nogo, and those who acted with Mr. Nogo men, that is, who had little jobs of their own to do, and in the doing of which Mr.
He built a cofferdam, sunk a shaft, planted twenty-three tons of powder in the tunnels he ran, and on May 25th, after notice duly served, which sent the bulk of the population to view-commanding hills, he pushed an electric button that fired the mine, throwing water and debris one hundred and fifty feet in the air.
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