Gauge needle and dial e gas lamp: o que têm em comum

1. Passo 1. Gauge needle and dial — faz parte de — Hygrometer. It shows the humidity.
2. Passo 2. Hygrometer — é feito de — Plant fibre. Humidity was shown by a fibre that changed length.
3. Passo 3. Plant fibre — é material para — Wick. A wick is twisted from plant fibres.
4. Passo 4. Wick — faz parte de — Oil lamp. The wick feeds oil to the flame.
5. Passo 5. Oil lamp — evoluiu para — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
6. Passo 6. Incandescent light bulb — evoluiu de — Gas lamp. Electricity displaced gas lighting.

Abrir Evothings