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

1. Step 1. Cipher rotors — is part of — Cipher machine. Discs with cross wiring.
2. Step 2. Cipher machine — uses — Cryptography. Encryption.
3. Step 3. Cryptography — is used in — Turing’s Bombe. Cryptanalysis of Enigma.
4. Step 4. Turing’s Bombe — has part — Relay. Electromechanics.
5. Step 5. Relay — is part of — Harvard Mark I. The Mark I was electromechanical, built from relays.
6. Step 6. Harvard Mark I — was inspired by — Babbage’s Analytical Engine. Howard Aiken named Babbage’s work as the source of his idea.

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