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Fig. 1—Two of the three bridges handling ore, coal, limestone, etc., at the docks of the Minnesota Steel Co., Duluth. This view gives a good idea of the size of the bridge Wind Pressure Is Bridge Hazar Ore, Coal and Dock Cranes: Often Threatened with Destruction During Severe Storms—New Type Anemometer with Recorder Shows Whether Opera- tion Is Safe or Unsafe—Automatic Control Developed ERTAIN types of outdoor cranes, such as coal or ore bridges, un- loading towers, gantry and ship- yard cranes, expose large areas to wind pressure and may not be moved or operated The author is assistant electrical engineer, Minnesota Steel Co., Duluth. FIG. 2—-THIS ORE UNLOADING CRANE OPERATED BY A STEEL AND WRECKED DURING A RECENT WIND STORM. pByY C.:O. BURTON’. safely during high winds. Ship op- erators are interested in the strength of the wind and commercial air ports or flying fields also require correct infor- mation at all times as to prevailing wind conditions. Therefore, it is of considerable im- portance that’: a means be had for meas- uring the velocity of the wind instantly and accurately. ‘ When the size and construction of coal and ore bridges are considered, the value of an exact record of wind velocity be- comes more apparent. Modern bridges —Courtesy Cleveland News COMPANY IN THE MIDDLE WEST WAS BLOWN OVER ] % . Bi IVER RECONSTRUCTION WILL COST MANY THOUSANDS OF DOLLARS 294 I ee ae ee ee ee 3 j ji