Word: tunneling
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Supersonic Wind Tunnel...
Though the University does not have the vast Guggenheim Memorial Laboratory, it does have the world's first supersonic speed wind tunnel. From this wind tunnel and other equipment have come experimental data that revolutionized jet engine design...
...tunnel was built with funds provided by the Pratt and Whitney Company, aircraft engine and propeller manufactures, for use in discovering the aerodynamic characteristics of the rotors used in the compressors of jet engines...
About two years ago, however, the city government went to work on Locust Street again, spending another $2,500,000 in the process. Last week the first trains finally ran through the Locust Street tunnel (providing a high-speed connection between the business district and Camden, N.J. via the Delaware River Bridge). But nobody had any such hopes for another ancient and expensive Philadelphia subway hole in the ground, the Arch Street tunnel, used only as a storage place for rivets and old rails since its excavation...
...Majestic Castle. Reid and Barry, along with a friend, got out of Oflag VII C all right, completely outsmarting their German keepers by using the classic tunnel scheme. Theirs was one of the first World War II escapes on record, and almost everything about it worked fine. They had got halfway to Yugoslavia when they were surrounded by a patrol. The next day they were back in Oflag VII C again...