Hourglass neck e incandescent light bulb: o que têm em comum

1. Passo 1. Hourglass neck — faz parte de — Hourglass. A narrow neck sets the rate.
2. Passo 2. Hourglass — funciona como — Water clock (clepsydra). The same principle of timing by outflow, with sand instead of water.
3. Passo 3. Water clock (clepsydra) — é feito de — Stone. The clepsydra from Karnak is a stone vessel.
4. Passo 4. Stone — é material para — Oil lamp. The first lamps were stone bowls (Lascaux).
5. Passo 5. Oil lamp — evoluiu para — Incandescent light bulb. The electric lamp replaced oil and gas lamps.

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