Jim Stone and a couple of his buddies are committing science at Central High School. There are all kinds of impressive computations and chemical formulas scrawled on the chalkboard. Jim appears to be singeing the hair on his arm with the flame of a Bunsen burner.
You can click on the photos to make them larger.
Working the slide rule
By the way I looked up “slide rule” to see if it was one word or two and discovered that slide rules (two words, by the way) were pretty much killed off by the electronic scientific calculator by 1974.
I love the Kilroy Was Here face on the bottom left of the board behind Jim.