Wheelset and optical telegraph: what they have in common

1. Step 1. Wheelset — has part — Axle. A common axle.
2. Step 2. Axle — is part of — Armillary sphere. The celestial axis.
3. Step 3. Armillary sphere — works like — Orrery. Both are mechanical models of the sky: the armillary sphere shows celestial circles, the orrery the planets' motion.
4. Step 4. Orrery — uses — Heliocentric system. The Copernican model.
5. Step 5. Heliocentric system — uses — Telescope. Galileo’s confirmations.
6. Step 6. Telescope — is used in — Optical telegraph. Signals were read through a telescope.

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