Punched card reading press and diesel engine: what they have in common

1. Step 1. Punched card reading press — is part of — Hollerith tabulator. Needles pass through the holes and close the circuit in mercury.
2. Step 2. Hollerith tabulator — uses — Electromagnetism. The counters click with electromagnets.
3. Step 3. Electromagnetism — is used in — Servomotor. A servo is an electric motor with feedback.
4. Step 4. Servomotor — is part of — Insulin pump. A stepper motor moves the plunger.
5. Step 5. Insulin pump — has part — Piston. The reservoir’s plunger.
6. Step 6. Piston — is part of — Diesel engine. Pistons move in the cylinders.

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