Word: tunnelling
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Dates: during 1920-1929
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...Anglo-French tunnel or bridge across the Straits of Dover...
...talk about 'Who Runs Harvard and Why' all you want," he said, "but I say that the University is run from underground tunnel by the engineering staff of the University...
Beginning at the Power House sear the river and twisting up through the Yard to Sever Hall is the heating tunnel known at the "subway." Here are the valves, pumps, reducers, and condensers which heat the college and the electric switches which control its lighting...
...planned, built and operated the first tunnel system under the Hudson river. He was Secretary of the Treasury in the most critical period in American history and Director General of Railroads throughout...
...geophone, an instrument invented by the French during the War to detect sapping operations of the Germans underground, has been developed by U. S. Engineers for rescue work in mines, gauging tunnel borings, etc. It contains diaphragms like a seismograph, which transmit the most delicate vibrations to the observer's ears. Sledge pounding can be detected 3,000 feet through solid rock, and ordinary talking through 50 feet of coal...