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The quadrant is an instrument used to simplify astronomical calculations and to make observations.  Developed by Isaac Carver, a student of Edmund Gunter, in 1706. The quadrant is used to observe and measure astronomical phenomena, to perform the basic tasks of surveying.

Designed to work at specific latitudes (in this case 38-41 N), the quadrant provides an intuitive computation for the following:

• Determining the Local Astronomical Time: Users would measure the sun’s altitude using the plumb line, locate the intersecting lines on the quadrant’s face, and read the local time.  This, coupled with a chronometer set to Greenwich Time (Zulu), allows for simple computation of Longitude.
• Measuring inclines and heights of inaccessible places.  The embedded shadow square allowed users to measure heights of trees, buildings, and distances using basic proportions.

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