The quadrant is a device for measuring the altitude of an object.
Altitude is measured by sighting an object along the meterstick, with the zero end touching your cheek bone (under your eye) and the other end pointing directly at the top of the object.
Let the weight swing freely so that the string is "pointing" straight down.
Tilt the stick so that the string touches the quadrant scale, then with your finger and thumb hold the string against the scale, bring the scale end around where you can read it.
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More information on the history of the Quadrant
(last updated 8/31/98)