Mainspring and rocket: what they have in common

1. Step 1. Mainspring — is part of — Music box. A mainspring turns the cylinder.
2. Step 2. Music box — has part — Pinned cylinder. The cylinder’s pins pluck the teeth of the comb.
3. Step 3. Pinned cylinder — inspired — Bouchon’s loom. Bouchon, the son of an organ maker, carried the idea of a recorded sequence over to punched tape.
4. Step 4. Bouchon’s loom — is made of — Paper. The program is a perforated paper tape.
5. Step 5. Paper — is material for — Rocket. The first rockets were paper tubes filled with gunpowder.

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