Name/Title
QuadrantEntry/Object ID
2013.3.66Description
This quadrant, although the name plate is missing, appears to resemble closely the one figured in plate CCCXLI fig. 65 (3rd Edition, Encyc. Brit. 1788-97) as Hadley's Quadrant. Quoting from page 724, "Hadley's quadrant is the chief instrument in use at present for observing altitudes at sea. The form of this instrument, according to the present mode of construction, is an octagonal sector of a circle, and therefore contains 45 degrees; but because of the double reflection, the limb is divided into 90 degrees."Collection
Moosnick Museum - Scientific Apparatus