Astrolabe and tank: what they have in common

1. Step 1. Astrolabe — works like — Armillary sphere. Three-dimensional and flat models of the celestial sphere.
2. Step 2. Armillary sphere — has part — Axle. The celestial axis.
3. Step 3. Axle — is used in — Four-wheel drive. Four-wheel drive sends engine power to both axles, front and rear.
4. Step 4. Four-wheel drive — is used in — Military jeep. Four-wheel drive.
5. Step 5. Military jeep — has part — Transmission (gearbox). A gearbox and a transfer case.
6. Step 6. Transmission (gearbox) — is part of — Tank. The transmission carries torque to the drive sprockets and lets the tank turn.

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