Large arc scale and CNC machine: what they have in common

1. Step 1. Large arc scale — is part of — Davis quadrant. A scale for small angles.
2. Step 2. Davis quadrant — evolved into — Octant. Reflecting angle gauges.
3. Step 3. Octant — has part — Mirror. Two mirrors.
4. Step 4. Mirror — is part of — Laser. A resonator made of mirrors.
5. Step 5. Laser — is used in — Laser cutting. A laser.
6. Step 6. Laser cutting — uses — CNC machine. CNC.

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