Abstract
Two cathode-ray oscillographs have been designed and employed to record the current in the natural lightning stroke. Three years of operation in the tower of the world's tallest structure, the Empire State Building in New York City, have given many records of strokes to this structure. Automatic and coördinated operation together with sufficient magnitude and time range of recording have enabled current-time characteristics of the direct stroke to be obtained. One instrument gives the low-magnitude, long-time current record of each stroke, while the other yields the high-magnitude, short-time components. Coverage from 50 to 200,000 amperes and from one microsecond to one second is provided with the records related properly in order and time.
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