Chip log e barril: o que têm em comum

1. Passo 1. Chip log — utiliza — Hourglass. The time of a speed measurement was taken with an hourglass.
2. Passo 2. Hourglass — utiliza — Gravity flow. Sand pours through under gravity.
3. Passo 3. Gravity flow — é utilizado em — Aqueduto. Water flows down a gradient without pumps.
4. Passo 4. Aqueduto — tem como parte — Arco. Roman aqueducts rested on arcades.
5. Passo 5. Arco — funciona como — Barril. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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