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Topic: Octant (instrument)


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In the News (Wed 26 Jun 19)

  
 The Octant
Only in the last hundred years the octant gave place to the sextant, which at present time, in spite of satellite navigation and other electronic aids, is still an essential navigational instrument.
Our instrument is in every detail a carefully made replica of an octant of the most expensive type made at the end of 18th century.
Previously described in principle by Sir Isaac Newton and even foreshadowed by Robert Hooke in 1644, the octant, incorporates the idea of using a mirror to bring a target object into coincidence with another, and then noting the inclination of the mirror, from which a value of the arc between objects could be obtained.
www.saundersandcooke.com /octant.html

  
 Octant, Gilbert & Coy. London. c. 1800
In the journals of the expedition, Lewis refers to it as an octant and Clark refers to the same instrument as a quadrant.
Although it is not the octant that Lewis and Clark carried with them on the expedition, it is similar to that octant in all its features, including size.
A common Octant of 14 Inches radius, graduated to 20, which by means of the nonius was divisible to 1, half of this sum, or 30 was perceptible by means of a micrometer.
www.lib.virginia.edu /speccol/exhibits/lewis_clark/exploring/ch5-34.html

  
 Rare Painted Octant
Its prominent representation on this octant case strongly indicates the instrument was the property of an American naval officer.
The octant is in fine condition with untouched deep patina on all metal parts, clear markings on the ivory, and with fine ebony frame.
It is most interesting to note that the pennant depicted on the octant case's lid could only be flown by U.S. Navy vessels.
www.aagaines.com /man/paint.html

  
 Octans The Octant
It honors the octant, which was invented by John Hadley in 1730.The instrument divided the circle into eight parts, which simplified the making of angular measurements in both astronomy and navigation.The octant later evolved into the sextant.The full name of the constellation is Octans Hadleianus.
Octans is a rather uninteresting constellation which includes the southern polar region.The constellation was created by Nicolas Louis de Lacaille in 1752.
www.bgsd.k12.wa.us /mgm/Constellations/Octans.html

  
 Instrument; Octant, Somalivico, Ebony, Brass Arm, Ivory Scale, English. [p4a.com, ltd.]
Instrument; Octant, Somalivico, Ebony, Brass Arm, Ivory Scale, English.
Permission to reproduce this information in other formats or to redistribute it beyond a subscriber’s immediate possession may be obtained by contacting permission@p4a.com.
The p4A.com database contains actual sales history information about this piece, including price realized at auction plus when and where sold.
www.p4a.com /itemsummary/72746.htm

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