1. Right-right turning test of picking up screws and screwing them into a board. Collection: Early 20th Century Engineering Lantern Slides Set: Aptitude Tests Date: undated Format: Image Agent: unknown
2. Various thread counts on metal studs and screws with time it takes to create them. Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
