Well shaft and laser: what they have in common

1. Step 1. Well shaft — is part of — Well. A vertical shaft down to the aquifer.
2. Step 2. Well — is made of — Stone. The walls of wells were lined with stone.
3. Step 3. Stone — is material for — Interferometer. Michelson’s instrument stood on a stone slab.
4. Step 4. Interferometer — has part — Mirror. Mirrors.
5. Step 5. Mirror — is part of — Laser. A resonator made of mirrors.

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