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Show CONSTRUCTION OF TUNNEL TRIUMPH OF SCIENCE CHICAGO. Sept. 15. The task of floating float-ing Into place tho twin steel tubes that will- make up tho La Salle street tunnel under tho Chicago river will he undertaken under-taken the rirst of the week. Tho tube? weighing innny tons will be made buoyant buoy-ant as automatic tires. Moated into their place and connected by a system that will reduce the uae of heavy and expensive muchinery to a minimum. The tubes, each of which Is eighteen feet in diameter, are ready for use and will bo pumped full of air. The scheme, as it has been worked out by the engineers, en-gineers, is to fasten the sections of the tube together, pump them full of air and stop both ends with heavy bulkheads Meanwhile, the tunnel will have been filled with water and the heavy inner-coating inner-coating of the tunnel will be tloated out upon it. Then will come the task of pumping the air out and letting water run into its place in the tubes Tho result will be that the tubes will sink and be drawn into place by ropes and heavy cables. |