Stadium e telescope: o que têm em comum

1. Passo 1. Stadium — tem como parte — Street light. Floodlights.
2. Passo 2. Street light — tem como parte — LED. LEDs.
3. Passo 3. LED — faz parte de — Traffic light. LEDs.
4. Passo 4. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.
5. Passo 5. Railway semaphore — evoluiu de — Optical telegraph. The semaphore idea.
6. Passo 6. Optical telegraph — utiliza — Telescope. Signals were read through a telescope.

Abrir Evothings