Quadrants and sextants were the invention of a much later period.
The quadrants are known technically as rheostats, or current-controllers.
The quadrants may again be divided and subdivided, and marked by pencil or with strings.
He knew the quadrants by heart, and knew that he was close to the asteroid belt.
Some of these vessels use compasses of Genoa, and regulate their voyages by means of quadrants and sea charts.
Plate clxi, f, represents four bundles of feathers arranged in quadrants about a rectangular center.
His circle was divided into four quadrants and these quarters divided into 90 degrees each.
In this coral the calicle is divided into quadrants by four principal septa, the main septum, counter septum, and two alar septa.
The mural arch in the same establishment, used for the testing of quadrants and other marine instruments, was also his work.
The more simple formula (Fig. 1) consisted of two concentric circles, the smaller of which was divided into four quadrants.