2. Solar granulation photographs fromthe stratosphere

Extract

The Princeton University Observatory carried out last summer three unmanned stratospheric balloon nights for the same purpose as that described in the preceding communication, namely to obtain high-definition photographs of the solar granulation. The special telescope for this purpose was built by the Perkin-Elmer Corporation, the electronic pointing mechanism was constructed by the Boulder Research Laboratories, and the balloons were manufactured and flown by General Mills Inc. The project was sponsored by the U.S. Office of Naval Research and by the U.S. Air Force.