13. Rhythm test for applicant dropping a ball into a rotating turntable. Collection: Early 20th Century Engineering Lantern Slides Set: Aptitude Tests Date: undated Format: Image Agent: unknown
14. Four pictures of one man's face with expressions above nose and mouth. Middle is blackened. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
15. Faces of mathematical prodigies Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
16. Drawings of the faces of Michelangelo and Alexander von Humboldt and a 3rd person. Collection: Early 20th Century Engineering Lantern Slides Set: Face-Related Data Date: undated Format: Image Agent: unknown
17. 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
