Glass tube e mechanical clock: o que têm em comum

1. Passo 1. Glass tube — faz parte de — Barômetro. A tube sealed at the top.
2. Passo 2. Barômetro — faz parte de — Weather station. A barometer.
3. Passo 3. Weather station — utiliza — Euclidean geometry. Instruments are set up on a site according to a standard.
4. Passo 4. Euclidean geometry — é utilizado em — Sundial. The scale is marked by the angle of the shadow.
5. Passo 5. Sundial — funciona como — Water clock (clepsydra). Two ancient ways to measure time: by a shadow and by flowing water.
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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