Meridian ring and truck: what they have in common

1. Step 1. Meridian ring — is part of — Globe. A tilted axis.
2. Step 2. Globe — is made of — Paper. The world map is glued onto the ball in paper gores.
3. Step 3. Paper — is material for — Rocket. The first rockets were paper tubes filled with gunpowder.
4. Step 4. Rocket — evolved into — Solid rocket motor. Gunpowder rockets.
5. Step 5. Solid rocket motor — is used in — Multiple rocket launcher. Rockets.
6. Step 6. Multiple rocket launcher — has part — Truck. On a truck chassis.

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