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"George B. Graves was born in Loudoun County June 1792. "A memorandum of articles belonging to the estate of Goldsmith Chandlee deceased, sold the 10th day of the 4th month 1821, 66 items were purchased by George Graves for the sum of $268.94 - 3/4 or 17% of the total sale of $1607.48 - 3/4, pages 110-117, Six Quaker Clock Makers by E. E. Chandlee." It is believed that the above George Graves was George B. Graves and that he made a portion of his vernier compasses from some of the parts bought at this sale.  Mr. Graves died near Winchester [Virginia] 29 January 1873."

Reference:  Smart, Charles E.   The Makers Of Surveying Instruments In America Since 1700  Troy, New York:  Regal Art Press.  1962