Machine tool e electrical telegraph: o que têm em comum

1. Passo 1. Machine tool — é utilizado em — Interchangeable parts. Identical parts can only be made on precise machine tools.
2. Passo 2. Interchangeable parts — funciona como — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
3. Passo 3. Movable type — evoluiu para — Linotype. Mechanized typesetting.
4. Passo 4. Linotype — utiliza — Tin. A line is cast from type metal (lead, tin, antimony).
5. Passo 5. Tin — é material para — Phonograph. The recording is on tin foil.
6. Passo 6. Phonograph — foi inspirado por — Electrical telegraph. Edison came to the phonograph while working on recording telegraph and telephone signals.

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