Hanes & Ruskin
P.O. Box 212    Old Lyme, CT 06371    
860-434-1800

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Octant


Octant

Large Regency period English vernier octant
by Joseph Gaitskill, London

$ The name 'octant' derives from the Latin 'octans' meaning eighth part of a circle, referring to the angle of 45 degrees between the arms of the frame. The scale is divided into 90 degrees, or one fourth of a circle. John Hadley (1682-1744) described an instrument of this sort to the Royal Society of London in 1731 and obtained a British patent in 1734. Accordingly, octants are sometimes known as Hadley quadrants.

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Octant
Octant
Octant
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