Signal post and cannon: what they have in common

1. Step 1. Signal post — is part of — Railway semaphore. A post.
2. Step 2. Railway semaphore — uses — Lever. The semaphore is set by a lever.
3. Step 3. Lever — is used in — Sternpost rudder. The rudder is turned with a tiller, which is a lever.
4. Step 4. Sternpost rudder — is part of — Caravel. A sternpost rudder.
5. Step 5. Caravel — evolved into — Galleon. Larger and more heavily armed.
6. Step 6. Galleon — has part — Cannon. Cannons on the decks.

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