Spindle and LIGO: what they have in common

1. Step 1. Spindle — evolved into — Spinning wheel. A wheel turns the spindle.
2. Step 2. Spinning wheel — has part — Belt drive. The wheel is linked to the spindle by a cord.
3. Step 3. Belt drive — is used in — Conveyor belt. The belt runs around the drive and tension drums.
4. Step 4. Conveyor belt — has part — Ball bearing. The rollers turn on bearings.
5. Step 5. Ball bearing — is part of — Base isolation. Friction pendulum bearings.
6. Step 6. Base isolation — is part of — LIGO. The suspension damps ground vibrations.

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