Science: Magnetic Sweeper

Heeding pleas of motorists that something be done about nails and sharp metal scraps on the highways, the Michigan Highway Department lately worked out a trailer which, hauled behind a truck, sucks up metal by magnetic attraction, feeds it into a hopper. The sweeper costs 35¢ per mile to operate, covers 42 miles per day. By last week it had accumulated more than a half ton of tire-damaging litter, including a pair of scissors.


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