Leyden jar and electrical telegraph: what they have in common

1. Step 1. Leyden jar — evolved into — Capacitor. The Leyden jar was the first capacitor.
2. Step 2. Capacitor — is made of — Tin. The plates are made of tin foil.
3. Step 3. Tin — is material for — Phonograph. The recording is on tin foil.
4. Step 4. Phonograph — was inspired by — Electrical telegraph. Edison came to the phonograph while working on recording telegraph and telephone signals.

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