Interferometer arm vacuum tubes and car: what they have in common

1. Step 1. Interferometer arm vacuum tubes — is part of — LIGO. Two 4 km vacuum tubes.
2. Step 2. LIGO — has part — Base isolation. The suspension damps ground vibrations.
3. Step 3. Base isolation — has part — Ball bearing. Friction pendulum bearings.
4. Step 4. Ball bearing — is part of — Car. The wheel hubs turn on bearings.

Open Evothings