Egyptian pyramid and hollerith tabulator: what they have in common

1. Step 1. Egyptian pyramid — uses — Plumb bob. Plumb bobs were used by Egypt’s builders.
2. Step 2. Plumb bob — is part of — Quadrant. A plumb line shows the vertical.
3. Step 3. Quadrant — evolved from — Astrolabe. A simplified angle gauge.
4. Step 4. Astrolabe — is a kind of — Computing device. An analogue calculator of celestial positions.
5. Step 5. Computing device — includes — Hollerith tabulator. A data-processing machine.

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