Jacob’s Staff
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A single staff or pole used for mounting a surveyor’s compass or other instrument. Used instead of a tripod, a Jacob’s staff is fitted with a ball-and-socket joint at its upper end, by means of which the instrument is adjusted to a level position; the foot is fitted with a metal shoe which facilitates pressing the staff firmly into the ground. many of the early land surveys in this country were made with surveyor’s compasses mounted upon Jacob’s staffs.

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