Octant and hollerith tabulator: what they have in common

1. Step 1. Octant — evolved into — Sextant. The sextant is an extended octant.
2. Step 2. Sextant — is part of — Sailing ship. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
3. Step 3. Sailing ship — has part — Compass. A magnetic compass.
4. Step 4. Compass — uses — Magnetism. The needle aligns with the Earth’s magnetic field.
5. Step 5. Magnetism — evolved into — Electromagnetism. Ørsted linked magnetism with current.
6. Step 6. Electromagnetism — is used in — Hollerith tabulator. The counters click with electromagnets.

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