Synthesizer and Babbage’s Analytical Engine: what they have in common

1. Step 1. Synthesizer — has part — Keyboard. A keyboard.
2. Step 2. Keyboard — is part of — Carillon. A keyboard.
3. Step 3. Carillon — has part — Pinned cylinder. Automatic carillons have a pinned drum.
4. Step 4. Pinned cylinder — works like — Punched card. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
5. Step 5. Punched card — is used in — Babbage’s Analytical Engine. Operations and numbers were entered on punched cards.

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