Optical telegraph e canhão: o que têm em comum

1. Passo 1. Optical telegraph — utiliza — Lens. Signals were read through telescopes.
2. Passo 2. Lens — faz parte de — Sextant. The sextant’s telescope.
3. Passo 3. Sextant — faz parte de — Sailing ship. The sextant and chronometer were a sailing ship’s navigation kit for finding latitude and longitude.
4. Passo 4. Sailing ship — inclui — Galleon. A sailing ship.
5. Passo 5. Galleon — tem como parte — Canhão. Cannons on the decks.

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