[The picture] shows the flashover and splintering of a 15-foot distribution-line wood pole. The flashover distance is about 10 feet. The voltage initiating the discharge rises at the rate of 3000 to 4000 kv per microsecond, reaching a crest of 2.5 million volts. A current of 23,000 amperes and of 50-microsecond duration follows the discharge.
[the following text refers to another picture
not shown here]
Original Caption by Science Service