Suspended test mass mirror and watt steam engine: what they have in common

1. Step 1. Suspended test mass mirror — is part of — LIGO. Suspended mirrors.
2. Step 2. LIGO — uses — Vacuum. 4 km vacuum tubes.
3. Step 3. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.
4. Step 4. Newcomen engine — evolved into — Watt steam engine. Watt improved Newcomen’s engine.

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