Quadro-negro e mechanical clock: o que têm em comum

1. Passo 1. Quadro-negro — utiliza — Giz. People write with chalk.
2. Passo 2. Giz — é um tipo de — Lime. Chalk is calcium carbonate, like limestone.
3. Passo 3. Lime — é material para — Cisterna. The walls were coated with lime plaster against leaks.
4. Passo 4. Cisterna — é feito de — Stone. Cisterns were cut into rock or lined with stone.
5. Passo 5. Stone — é material para — Water clock (clepsydra). The clepsydra from Karnak is a stone vessel.
6. Passo 6. Water clock (clepsydra) — evoluiu para — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

Abrir Evothings