Dimpled thimble and electrical telegraph: what they have in common

1. Step 1. Dimpled thimble — is part of — Thimble. Dimples brace the eye of the needle.
2. Step 2. Thimble — is made of — Bronze. Ancient thimbles were bronze.
3. Step 3. Bronze — is made of — Tin. Tin makes bronze hard.
4. Step 4. Tin — is material for — Phonograph. The recording is on tin foil.
5. Step 5. Phonograph — was inspired by — Electrical telegraph. Edison came to the phonograph while working on recording telegraph and telephone signals.

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