Diving bell and electrical telegraph: what they have in common

1. Step 1. Diving bell — has part — Bell. A body open at the bottom.
2. Step 2. Bell — is part of — Alarm clock. A bell rings.
3. Step 3. Alarm clock — has part — Electric bell. A bell.
4. Step 4. Electric bell — has part — Electromagnet. An electromagnet strikes a small hammer.
5. Step 5. Electromagnet — is part of — Electrical telegraph. Morse’s receiver.

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