Moderate difficulty suitable for most players
Arcane Instruments of Antiquity
Challenging puzzle for experienced crossword solvers
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Across
- 1. Mariner’s angular gauge named after a sixth of a circle
- 2. Instrument determining area by tracing a perimeter’s curve
- 5. One-quarter circle device for altitude, not a musical interval
Down
- 3. Precise engraver for graduated scales, pioneered by Ramsden
- 4. Celestial analog computer measuring angles by ancient scholars
- 6. Obscure surveying tool, predecessor to modern theodolites
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