CV joint and telescope: what they have in common

1. Step 1. CV joint — uses — Torque. It transmits torque at an angle.
2. Step 2. Torque — is used in — Geneva drive. It turns continuous rotation into intermittent motion.
3. Step 3. Geneva drive — is part of — Film projector. Intermittent advance of the film.
4. Step 4. Film projector — has part — Lens. A projection lens.
5. Step 5. Lens — is part of — Telescope. An objective and an eyepiece.

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