The quadrant was an essential instrument used by the artillery crew to determine the elevation of a gun tube, and thus adjust the range of a projectile. Constructed of wood, they look rather simple, but the quarter-circle panel at one end (hence “quadrant”) is marked off in degrees on one side. With the wood extension placed in the barrel and a simple plumb line with weighted end attached at the upper end, the gunner could easily read the angle of elevation and adjust for range.

This is in excellent condition with good finish and fully legible markings. The end of the shaft was drilled out and fitted with a brass lid to hold the plumb line and bob. These are missing, but a satisfactory replacement for display would not be tough to fashion.  [ad] [ph:m]

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