Lâmpada de arco e fole: o que têm em comum

1. Passo 1. Lâmpada de arco — faz parte de — Street light. The first electric street lights were arc lamps (the “Yablochkov candle”, 1878).
2. Passo 2. Street light — evoluiu de — Gas lamp. Gas lamps.
3. Passo 3. Gas lamp — tem como parte — Valve. A gas supply valve.
4. Passo 4. Valve — faz parte de — Fole. A valve in the bellows lets air in when they open and keeps it from escaping back.

Abrir Evothings