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Show Magnets Are Used To Clean Crop Seed Industrial research has developed devel-oped a method of screening weed seed from crop seeds. The first step in the process is to spray the seed clover, for instancewith in-stancewith a "fog" of wet iron particles. The particles stick to the softer, rougher weed seeds, and slide off the hard clover seeds. When the seed is run over a magnet, the iron particles with weed seeds attached are dragged out and the clover seed can be bagged. Two seed companies have tested th process and find it a success. Magnets also are being used to clear roads of nails and other metal objects which might puncture punc-ture tires. That process was developed de-veloped during World War II, when enemy planes began sowing Allied air strips with bits of metal shaped Ilka children's jacks. The metal punctured airplane ttres and caused accidents. The Minnesota Highway Department Depart-ment has mounted bar-shaped magnets on trucks to hang about five Inches above the surface of the road and grab up tacks, nails, wire, bolts, screws. A 75-mile sweep i reported to have collected collect-ed 643 pounds of such junk. |