A few men of an unidentified infantry-regiment pose with a carbide or acetylene lamp mounted on a small tripod. The model is a Carl Zeiss AS 25 Scheinwerfer.
There is more than one way to view a solar eclipse!
This photo is titled "Mr. Ikels of the US Air Force School of Aerospace Medicine projects a solar eclipse onto a board for safe viewing by base personnel, 6.1.1984"