INTER-OFFICE MEMORANDUM

DATE: July 24, 1945

TO: Lt. Taylor
FROM: V. Weisskopf
SUBJECT: EYE WITNESS ACCOUNT

You have asked me to submit to you an eye witness account of the explosion. I was located at base camp and watched the phenomenon from a little ridge about 100 yds. east of the water tower. Groups of observers had arranged small wooden sticks at a distance of 10 yds. from our observation place in order to estimate the size of the explosion. They were arranged so that their distance corresponded to 1000 ft. at zero point. I looked at the explosion through the dark glass, but I have provided for an indirect view of the landscape in order to see the deflected light.