Another gem from Shorpy. Here's what the caption says:
September 1942. "Learning how to determine latitude by using a sextant is Senta Osoling, student at Polytechnic High School, Los Angeles. Navigation classes are part of the school's program for training its students for specific contributions to the war effort." View full size. 4x5 Kodachrome transparency by Alfred Palmer.
The Library of Congress has this picture too, along with a male student, same pose, same sextant. He was Thomas Graham, a member of the Victory Corps. But Senta was prettier, so her picture shows up in all the blogs.
At the time of this picture, Los Angeles Polytechnic High School --the second oldest school in the city--stood and Washington Blvd. and Flower Street. It moved to the San Fernando Valley in 1957.