Shed stick and optical telegraph: what they have in common

1. Step 1. Shed stick — is part of — Warp-weighted loom. It separates the threads for the weft to pass.
2. Step 2. Warp-weighted loom — uses — Universal gravitation. The warp threads are tensioned by weights.
3. Step 3. Universal gravitation — evolved from — Kepler’s laws. Newton derived gravitation from Kepler’s laws.
4. Step 4. Kepler’s laws — evolved from — Heliocentric system. A refinement of Copernicus.
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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