Word: fulchronograph
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Dates: during 1940-1949
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...traps record both intensity and duration of the flash. Electric-eye cameras reveal the number of separate pulses within a single stroke. Another device (the fulchronograph) clocks the quickest stroke and measures the amount of current. Its heart is an ever-turning aluminum wheel, with hundreds of small strips of magnet steel projecting from its rim. Lightning, when it strikes, creates an electrical field in coils which magnetize the strips. When the fins are removed in the laboratory their magnetism is measured, gives the strength of the stroke charted...
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