Overlocker and atomic clock: what they have in common

1. Step 1. Overlocker — evolved from — Sewing machine. A specialized sewing machine.
2. Step 2. Sewing machine — inspired — Cinématographe. Louis Lumière said he came up with the intermittent film feed while watching the fabric feed of a sewing machine.
3. Step 3. Cinématographe — has part — Lens. A lens.
4. Step 4. Lens — is part of — Spectroscope. A collimator.
5. Step 5. Spectroscope — is used in — Spectral lines. They are observed with a spectroscope.
6. Step 6. Spectral lines — is used in — Atomic clock. The second is defined by the frequency of an atomic transition.

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