Metal rod with knob and bell: what they have in common

1. Step 1. Metal rod with knob — is part of — Electroscope. It conducts the charge.
2. Step 2. Electroscope — is made of — Gold. With leaves of gold leaf.
3. Step 3. Gold — is material for — Wristwatch. The case is gold or silver.
4. Step 4. Wristwatch — is a kind of — Mechanical clock. A wristwatch is a mechanical clock made small enough to wear.
5. Step 5. Mechanical clock — includes — Alarm clock. A clock.
6. Step 6. Alarm clock — has part — Bell. A bell rings.

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