Small arc scale and industrial robot: what they have in common

1. Step 1. Small arc scale — is part of — Davis quadrant. A scale for large 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 — EUV lithography. Mirror optics (lenses absorb EUV).
5. Step 5. EUV lithography — is used in — Microprocessor. Leading-edge processors.
6. Step 6. Microprocessor — is part of — Industrial robot. A microprocessor-based controller is in charge.

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