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Show Concrete In Gatun Dam. Tho mere mass of tho concreto Moor nnd side walls of tho locks at Gatun will bo sufficient to glvo them groat stability; but with a viow to adding a further safeguard against rupture ln tho event, say, of earth-quako earth-quako shocks, tho government engineers en-gineers intond to re-enforco the concreto con-creto by Imbedding in it no loss than 7,000 tons of old rail. This metal consists partly of n light rail which was used during tho ora of French construction, nnd partly of. moro modern mod-ern American mils, which havo been so badly bent that they can be no louger uesd In tho track. |