Signal post e gyroscope: o que têm em comum

1. Passo 1. Signal post — faz parte de — Railway semaphore. A post.
2. Passo 2. Railway semaphore — evoluiu de — Optical telegraph. The semaphore idea.
3. Passo 3. Optical telegraph — utiliza — Telescope. Signals were read through a telescope.
4. Passo 4. Telescope — inclui — Space telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.
5. Passo 5. Space telescope — tem como parte — Gyroscope. Pointing gyroscopes.

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