Torpedo and railway semaphore: what they have in common

1. Step 1. Torpedo — has part — Gyroscope. Obry’s gyroscope keeps the course.
2. Step 2. Gyroscope — is part of — Space telescope. Pointing gyroscopes.
3. Step 3. Space telescope — is a kind of — Telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.
4. Step 4. Telescope — is used in — Optical telegraph. Signals were read through a telescope.
5. Step 5. Optical telegraph — evolved into — Railway semaphore. The semaphore idea.

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