Engineering and Contracting . AND CONTRACTOR SHOULD HAVE A COPY Write for 16-page Table of Contents. THE MYRON C. CLARK PUBLISHING CO. 355 Dearborn St., CHICAGO June 17, 1908. ENGINEERING-CONTRACTING 15 Why The Oscillating Tower Eliminates The Dead Load BY counterweighting a heavy window a child can raise it, because the child has merely to overcome thecomparatively slight resistance of friction of the pulleys. In like manner, by providing an oscillatingtower we make a cableway that is counter-balanced; and, as a result, the electric motor is a child in sizecompared with the engines used on an
Engineering and Contracting . AND CONTRACTOR SHOULD HAVE A COPY Write for 16-page Table of Contents. THE MYRON C. CLARK PUBLISHING CO. 355 Dearborn St., CHICAGO June 17, 1908. ENGINEERING-CONTRACTING 15 Why The Oscillating Tower Eliminates The Dead Load BY counterweighting a heavy window a child can raise it, because the child has merely to overcome thecomparatively slight resistance of friction of the pulleys. In like manner, by providing an oscillatingtower we make a cableway that is counter-balanced; and, as a result, the electric motor is a child in sizecompared with the engines used on any other type of cableway. In brief, our motor does not have to liftthe dead load, nor does it have to overcome the grade due to the sag of the cable. Due to the oscillatingtower and its counterweight, the sag in the cable becomes less and less as the trolley and its loadapproaches the tower. The counterweight goes down and the trolley rises, and the result is precisely thesame as if the trolley were running on a level Showing Battery of Balanced Cable Cranes at work on the Erie R. R. cut, Bergen Hill, Jersey City. Capacity of5 tons load lift at 80 feet a minute. speed 1,.500 ft. per minute. But one rail under each end of cableway. Our catalog explains not onlv the theory which accounts for this remarkable result, but it givesnumerous examples of existing plants whose operation proves the result. Send for our Catalog No. 2C. THE BALANCED CABLE CRANE CO. 133 WILLIAM STREET NEW YORK CITY IN WRITING to our Advertisers for CATALOGS or PRICES please mention ENGINEERING-CONTRACTING. i6 ENGINEERING-CONTRACTING Vol. XXTX. No. 25. JOHN W. ALVORD, C. E, Consulting EngineerFor Hydraulic and Sanitary Work« Hartford THE AMERICAN BUREAU OFINSPECTION AND TESTS Consulting and Supervising Engineers iQspection of Riillway and Structural Materials Cement Testing—Chemical Analyses—Physical Testa Monadnock Block, Chicaso29 Broadway. New York. Wabash Pi
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