Speedometer and screw press: what they have in common

1. Step 1. Speedometer — is part of — Cruise control. It compares with the speed reading.
2. Step 2. Cruise control — has part — Servomotor. A servo moves the throttle.
3. Step 3. Servomotor — is part of — Inkjet printer. Stepper motors for the carriage and feed.
4. Step 4. Inkjet printer — uses — Ink. Ink.
5. Step 5. Ink — is used in — Gutenberg printing press. An impression needs ink; Gutenberg used an oil-based one.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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