(6693) Classrooms, Interiors, Old Main, 1935

Students from the Speech Department gather around a machine that possibly measures respiration or other body functions, possibly a kymograph in a classroom in Wayne University's Old Main, Detroit, Michigan.

To the right, a woman has a white tube in her mouth, which is connected to a respirometer on a table nearby. To the left, a man holds the microphone of a Dictaphone machine in front of him. In the background: posters of the human brain and nasal/tracheal area