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Octant (instrument)

Not to be confused with Sextant, a similar type of reflecting instrument.
Octant. This instrument, labelled Crichton - London, Sold by J Berry, Aberdeen, appears to have an ebony frame with ivory scale, vernier and signature plate. The index arm and mirror supports are brass. Rather than use a sighting telescope, this instrument has a sighting pinnula.

The octant, also called a reflecting quadrant, is a reflecting instrument used in navigation.

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