Pole arm and screw press: what they have in common

1. Step 1. Pole arm — is part of — Planimeter. A lever with a fixed pole.
2. Step 2. Planimeter — is part of — Differential analyser. Wheel-and-disc integrators.
3. Step 3. Differential analyser — is a kind of — Computing device. An analogue computer.
4. Step 4. Computing device — includes — Printer. Peripherals.
5. Step 5. Printer — works like — Gutenberg printing press. A printer is a personal printing press: it transfers an image onto paper.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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