Music printing e optical telegraph: o que têm em comum

1. Passo 1. Music printing — utiliza — Movable type. Music type.
2. Passo 2. Movable type — evoluiu para — Linotype. Mechanized typesetting.
3. Passo 3. Linotype — utiliza — Tin. A line is cast from type metal (lead, tin, antimony).
4. Passo 4. Tin — é material para — Phonograph. The recording is on tin foil.
5. Passo 5. Phonograph — foi inspirado por — Electrical telegraph. Edison came to the phonograph while working on recording telegraph and telephone signals.
6. Passo 6. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.

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