Page:Popular Science Monthly Volume 88.djvu/521

 Popular Science Monthly

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���I American Press Association

��The thousands of tons of earth and rock precipitated into the Panama Canal had to be re- moved before shipping could pass through the canal. Two dredges and the ship "Newton" were caught at this point. It took seventy-nine days to dig the '"Newton" out

��suming that a channel through the ob- structed area can be maintained."

Seven dredges have been more or less steadily working at the bases of the Culebra slides for the last few months. Three of these are fifteen-yard dipper- dredges, one is a five-yard dipper- dredge, one a ladder - dredge and the others are sea-going suction and pipe- line suction-dredges.

The two photographs appearing on these pages show the lifteen-yard dipper-

��dredge Cascadas at work. This is the largest all-steel dredge in the world. It was made in Germany especially for use in the canal and was shipped in parts to the Zone. The dredge is one hundred and forty-four feet long. The bucket shown in the picture lifts fifteen wagon- loads of material at a time. In a single day fourteen thousand cubic >ards — in other words as many wagon-loads — can be removed, although a record of seventeen thous uid cubic vards has been made.

��The May Popular Science Monthly will be on sale Saturday, April fifteenth (West of the Rockies, Saturday, April twenty-secondj.

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