Corridor Traffic Light (Jan, 1948)

If the instruments are so delicate, why doesn’t she use a cart instead of carrying them all piled up like that. Plus the traffic light doesn’t do you a whole lot of good if you can’t see it because, uh, you’re carrrying a pile of delicate instruments.

Corridor Traffic Light
Wartime’s proximity fuse is regulating hallway traffic at General Electric’s Schenectady research laboratory. Above, the girl at left has been “picked up” by a microwave transmitting-receiving unit (A), operating traffic light (B). The girl at right, carrying delicate instruments, is warned by a red light that the corridor is not clear.