Safety pin and LIGO: what they have in common

1. Step 1. Safety pin — has part — Spring. A coiled spring.
2. Step 2. Spring — is part of — Bogie. Spring suspension.
3. Step 3. Bogie — has part — Ball bearing. Axle boxes with roller bearings.
4. Step 4. Ball bearing — is part of — Base isolation. Friction pendulum bearings.
5. Step 5. Base isolation — is part of — LIGO. The suspension damps ground vibrations.

Open Evothings