Page:Popular Science Monthly Volume 89.djvu/556

 Inventions Whioli Improve the Motor-Truck and Make

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��Above, a truck for mine rescue work equipped with a wonderful variety of scien- tific paraphernalia, including a complete telephone system

At right, a hydraulic pressed steel wheel used on trucks in war service. Its strength is rated higher than that of any other type of wheel made

��At left, an ad- justable two- bar extension rear axle for a motor- cycle sidecar

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��Above: In Long Beach, California, an immense disk is painted in the center of eacli street intersection as a guide to automobiles and vehicles

At left, a removable motor-truck headlight carried only nt night. During the day valves fastened to the tube arc closed and the headlight is removed from its U-shapcd stand in front

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