Binary number system and archimedes’ screw: what they have in common

1. Step 1. Binary number system — is used in — Digital signal processor. It processes a digital signal.
2. Step 2. Digital signal processor — is part of — Ultrasound scanner. Forming the image.
3. Step 3. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.
4. Step 4. Sonar — is part of — Submarine. Underwater acoustics.
5. Step 5. Submarine — has part — Propeller. A propeller.
6. Step 6. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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