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Online Show 2020
Essentials Octant |
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Online Show 2020
Essentials Octant |
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Large Regency period English vernier octant
by Joseph Gaitskill, London |
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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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$3900.00
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Lee Hanes & Joy Ruskin Hanes HANES & RUSKIN
P.O. Box 212 Old Lyme, CT 06371 860-434-1800 |