Semaphore tower and r-7 rocket: what they have in common

1. Step 1. Semaphore tower — is part of — Optical telegraph. A tower with movable sails.
2. Step 2. Optical telegraph — uses — Telescope. Signals were read through a telescope.
3. Step 3. Telescope — includes — Space telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.
4. Step 4. Space telescope — has part — Gyroscope. Pointing gyroscopes.
5. Step 5. Gyroscope — is part of — V-2 rocket. A gyroscopic guidance system.
6. Step 6. V-2 rocket — evolved into — R-7 rocket. The Soviet rocket programme began by studying the V-2 (the R-1 was its copy).

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