Astrolabe rete and watt steam engine: what they have in common

1. Step 1. Astrolabe rete — is part of — Astrolabe. An openwork star map.
2. Step 2. Astrolabe — works like — Armillary sphere. Three-dimensional and flat models of the celestial sphere.
3. Step 3. Armillary sphere — has part — Axle. The celestial axis.
4. Step 4. Axle — is part of — Potter’s wheel. A vertical axis.
5. Step 5. Potter’s wheel — has part — Flywheel. A lower flywheel turned by the foot.
6. Step 6. Flywheel — is part of — Watt steam engine. The flywheel evens out rotation.

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