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July, 1918 THE MARINE REVIEW 43 10 Tons at 73 Feet Radius The six illustrations show typical installations of DRAVO WHIRLERS that are doing their part toward the quick production of Pershing’s ‘‘Bridge of Boats.” These are. the “Ideal Tools for the Ship- yard”. They cover large territory; lift their full load at 73 feet from the center. The towers are 34 to 55 feet high, built to allow freight cars to operate between the whirler tower’s 20' gauge tracks. Whirlers move up and down the yard with full load at a speed of 250 to 300 feet per minute, placing material in the yard or on the ways. DELIVERIES Dravo Whirlers can be supplied on short notice. They are much lower in price than other machines built to do similar work. Write for full particulars. THE DRAVO CONTRACTING CO. "ENGINEERING WORKS DEPARTMENT PITTSBURGH, PA. Philadelphia Cleveland Indianapolis Please mention THe Marine Review when writing to Advertisers