Slide rule stock and particle accelerator: what they have in common

1. Step 1. Slide rule stock — is part of — Slide rule. The fixed part with the scales.
2. Step 2. Slide rule — is a kind of — Computing device. An analogue calculator.
3. Step 3. Computing device — includes — Turing’s Bombe. A computing device.
4. Step 4. Turing’s Bombe — has part — Relay. Electromechanics.
5. Step 5. Relay — has part — Electromagnet. An electromagnet switches the contacts.
6. Step 6. Electromagnet — is used in — Particle accelerator. Bending magnets.

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