Projection screen and archimedes’ screw: what they have in common

1. Step 1. Projection screen — is part of — Camera obscura. The surface on which the image is seen.
2. Step 2. Camera obscura — evolved into — Camera. A camera is a camera obscura with a light-sensitive layer.
3. Step 3. Camera — evolved into — Smartphone camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.
4. Step 4. Smartphone camera — is part of — Quadcopter (drone). A camera.
5. Step 5. Quadcopter (drone) — has part — Propeller. Air propellers.
6. Step 6. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

Open Evothings