Reflections on a decade of grade‐school science
DOI: 10.1063/1.3070890
At a recent science convention, we had a display table showing some of the materials developed by the Elementary Science Study. One of the items on display was a small motor, made from one D cell, two fahnestock clips, a rubber band, 16 inches of enameled copper wire, two safety pins and one small flat magnet. The rotor for the motor is made by winding the wire around your finger, leaving the two ends protruding about an inch on opposite sides of the loop, and scraping the enamel off the ends. (See Batteries and Bulbs Teacher’s Guide for more details.) There is no commutation for this loop. Why it works has yet to be clearly formulated, and some electrical engineers have told us it will not work.
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References
1. Webster Division, McGraw‐Hill Book Company, Manchester Road, Manchester Missouri 63011.
More about the authors
Joe Griffith, Thoreau School, Concord, Massachusetts.
Philip Morrison, Massachusetts Institute of Technology.
