25. Chart comparing output, intelligence, and boredom of factory workers with inferior intelligence who perform soap wrapping and chocolate packing. Collection: Early 20th Century Engineering Lantern Slides Set: H. I. M. (Human Interaction Management) Date: undated Format: Image Agent: unknown
26. Effect of noise vs. quiet on the ability to work. The woman typist is wearing a mask under quiet and noisy conditions ; her breath is monitored by a man who is taking notes. Collection: Early 20th Century Engineering Lantern Slides Set: H. I. M. (Human Interaction Management) Date: undated Format: Image Agent: unknown
