Click on the image to zoom. Click and drag your mouse over the image to move it left or right. Use the small navigation window to select the area you wish to zoom on.
Gunter's quadrant design is drawn on the face in colored inks and on the reverse is the declination diagram for mean years.
"B.W./AD 1770/calculated [for] the Meridian/o[f] Boston/July [11th?] 1770."
On the reverse "sic transit/Gloria Mundi."
Quadrants helped determine position on the earth's surface and were used in surveying for property and boundaries and for navigation at sea.
If you'd like to privately share a comment with MMN staff, please use this form.