Punched card reading press and turbine: 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 — Electronic ink. The pigment moves in an electric field.
4. Step 4. Electronic ink — is made of — Titanium. The white particles are titanium dioxide.
5. Step 5. Titanium — is material for — Turbojet engine. Compressor blades.
6. Step 6. Turbojet engine — has part — Turbine. The turbine drives the compressor.

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