several times greater than that of the noon sun. I felt a strong sensation of heat on the exposed skin of face and arms, lasting for several seconds and at least as intense as the direct noon sun.
It should be noted that my eyes were adapted to twilight or perhaps even to somewhat brighter light because of the use of the radio dial light I had made just previous to the T —45 second signal.
2. Growth of the mushroom
For a time which I guess to be less than two seconds the bright disk produced an after effect in my eyes which spoiled the details of the following process. I quickly realized that my vision was improving, that the image was becoming much fainter and less white. I then took off the welding glass and several seconds later the sun glasses as well. Beginning at T = +2 to 3 seconds, I observed the
