Page:Popular Science Monthly Volume 89.djvu/717

 Truck Which Are Making Them More Versatile

���At right: Unloading logs ■"--^ from a truck over a '-'^\\ wooden pier into Lake
 * -\ K Sammamish, Washington

���Above: An angle wrench with adjustable jaws which will take any tap up to one and one-quarter inches at any one of eight different angles

���A spark-plug with a turbine fan rotated by the engine explosions. Hot sparks are deliv- ered to the bushing, giving a larger spark- ing area and throwing off waste oil deposits

��A gas-electric suction street-sweeper. The dirt is picked up by a revolving brush and sucked into a pipe where a blower sends it to the trailer. There it is screened and packed for removal

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