concluded that the pressure exerted by the explosion varied from 5.3 to 8.0 tons per square yard. Others found that mica, of which the melting point is 900° C., had fused on granite gravestones three hundred and eighty yards from the center; that telephone poles of Cryptomeria japonica, whose carbonization temperature is 240° C., had been charred at forty-four hundred yards from the center; and that the surface of gray clay tiles of the type used in Hiroshima, whose melting point is 1,300° C., had dissolved at six hundred yards; and, after examining other significant ashes and melted bits,
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