Soap e mechanical clock: o que têm em comum

1. Passo 1. Soap — utiliza — Lime. The alkali for soapmaking was obtained from ash and lime.
2. Passo 2. Lime — é material para — Cisterna. The walls were coated with lime plaster against leaks.
3. Passo 3. Cisterna — faz parte de — Aqueduto. Distribution reservoirs.
4. Passo 4. Aqueduto — utiliza — Gravity flow. Water flows down a gradient without pumps.
5. Passo 5. Gravity flow — é utilizado em — Water clock (clepsydra). Water flows out at a constant rate under gravity.
6. Passo 6. Water clock (clepsydra) — evoluiu para — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

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