Film projector and shipping container: what they have in common

1. Step 1. Film projector — has part — Geneva drive. Intermittent advance of the film.
2. Step 2. Geneva drive — uses — Torque. It turns continuous rotation into intermittent motion.
3. Step 3. Torque — is used in — Planetary gear. It transmits rotation through planet gears.
4. Step 4. Planetary gear — includes — Differential. A differential is a planetary mechanism.
5. Step 5. Differential — is part of — Truck. Differentials in the drive axles.
6. Step 6. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.

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