Pivot joint and r-7 rocket: what they have in common

1. Step 1. Pivot joint — is part of — Compasses. The pivot of the opening.
2. Step 2. Compasses — is used in — Euclidean geometry. Constructions with compass and straightedge.
3. Step 3. Euclidean geometry — is used in — Shukhov Tower. The hyperboloid is assembled from straight bars.
4. Step 4. Shukhov Tower — has part — Antenna. A radio tower.
5. Step 5. Antenna — is part of — Sputnik 1. Four whip antennas.
6. Step 6. Sputnik 1 — uses — R-7 rocket. Launched by an R-7 rocket.

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