Tallow e tunnelling shield: o que têm em comum

1. Passo 1. Tallow — é utilizado em — Oil lamp. The fuel was animal fat, later oil.
2. Passo 2. Oil lamp — evoluiu para — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
3. Passo 3. Incandescent light bulb — evoluiu de — Gas lamp. Electricity displaced gas lighting.
4. Passo 4. Gas lamp — evoluiu para — Street light. Gas lamps.
5. Passo 5. Street light — faz parte de — Tunnel. Lighting.
6. Passo 6. Tunnel — utiliza — Tunnelling shield. Shield tunnelling.

Abrir Evothings