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Show com 3arges Made of Cement and Locks to Be of Same Material Washington. Aug. L'C With tho last of throe l.arges built of concrete just completed for work, officials of the Isthmian canal are to undertake further novel experiments with thU construction material. According to a report fr..ni th canal zoiik, experiments ure to lio undertaken at one on the Atlantic aijd Pacific divisions of the cajial t determine the effect of sea water on the concrete for the lower b.cks at Gatun and Mfraflores. The object Is to ascertain if Ftep will be neoet-.-sarv In order to protect the concrete. Slabs ' of concrete will be subjected to the pea water. Some of them will be left In th"Ir natvral Mate and some w ill be treate l with sodium silicate sili-cate In the form of soluble glas In solutions of dlf'orer.t strength and some of I hem wl'l be treated with alum anil soap, using three quarters of a pound of soap to a gallon of water wat-er applied Imllirg hot for the first wash and twenty-four hours later a solution of alum, two ounces to the gallon, applied cold. The only walls that will )e snl-jpcted snl-jpcted to action of sail water will be J those ef the lower ea level lorVs I and the guide walls leadinc into the locks. At Mlrpflores about I'mhhi.1 square feet of serface will be th is exposed and at Gatiti alut 1,27",--000 square feci. ' |