In Hiroshima, steel frame buildings were destroyed 4,200 feet from X, and
to 4,800 feet in Nagasaki.

In both cities, the mass distortion of large steel buildings was observed
out to 4,500 feet from X.

In Nagasaki, reinforced concrete smoke stacks with 8" walls, specially
designed to withstand earthquake shocks, were overturned up to 4,000 feet
from X.

In Hiroshima, steel frame buildings suffered severe structural damage up to
5,700 feet from X, and in Nagasaki the same damage was sustained as far as
6,000 feet.

In Nagasaki, 9" brick walls were heavily cracked to 5,000 feet, were
moderately cracked to 6,000 feet, and slightly cracked to 8,000 feet. In
both cities, light concrete buildings collapsed out to 4,700 feet.

In Hiroshima, multi-story brick buildings suffered structural damage up to
6,600 feet, and in Nagasaki up to 6,500 feet from X.

In both cities overhead electric installations were destroyed up to 5,500
feet; and trolley cars were destroyed up to 5,500 feet, and damaged to
10,500 feet.

Flash ignition of dry, combustible material was observed as far as 6,400
feet from X in Hiroshima, and in Nagasaki as far as 10,000 feet from X.

Severe damage to gas holders occured out to 6,500 feet in both cities.