W & L.E Gurley Antique American Surveyor’s Vernier Compass Kit For Sale

This is a museum-grade, remarkably complete example of a 19th-century W. & L. E. Gurley Surveyor’s Vernier Compass. Featuring a hand-engraved dial face, this instrument represents the peak of American scientific instrument manufacturing during the post-Civil War Reconstruction era. It is housed in its original, custom-fitted wooden transit box along with its full array of period-correct field accessories.The Compass Instrument Dial Face: Features a brilliant, hand-silvered dial face with an elaborately hand-engraved signature script reading: "W. & L. E. Gurley, Troy, N.Y." The calligraphy displays characteristic V-cut chiseled depths and weighted strokes exclusive to pre-1876 hand-work.Orientation: The dial face correctly features the historically reversed East/West cardinal positions (E on the left, W on the right) to allow surveyors to read direct magnetic headings without manual calculation.Needle & Mechanics: Equipped with a standard, delicately balanced steel magnetic needle, an outturned variation arc with an adjustable vernier mechanism at the bottom of the limb, a central hand-engraved North fleur-de-lis emblem, and an external mechanical needle-lifter screw.Chassis & Finish: The heavy brass body retains its historic, chemically blackened "bronze" anti-glare finish with minor field-wear patina. Dual integrated spirit level housings are mounted to the main cross-arms.Accessories & Transit CaseProtective Dust Cap: Includes the original, heavy, form-fitting circular brass cover designed to seal and protect the glass face and delicate needle during transit. Shows a rich, uncleaned historic brown patina with natural surface spotting.Sight Vanes (Alidades): Includes the complete pair of original, matching detachable brass vertical sight vanes with finely machined slot-and-pin viewing apertures.Mounting Hardware: Includes the original brass ball-and-socket leveling base assembly (Jacob’s staff/tripod mount).Transit Box: Accompanied by the original, custom-carved solid hardwood (walnut/mahogany) transit box featuring original brass hinges, secure hook-closures, specialized internal wooden support blocks, and a green felt-lined plumb bob recess.
Instrument Face: Excellent. The hand-engraved silvered dial is sharp, legible, and unmarred, free of heavy oxidation or scratching. Glass is clear and intact.Mechanicals: The needle lifter engages smoothly.Cosmetics: The brass chassis features an authentic, uncleaned field patina with minor thinning to the original blackened bronze finish on high-friction corners, consistent with light historical fieldwork.Casing: The wooden transit box remains structurally sound with an excellent, natural aged wood grain. Internal felt is largely preserved with expected age discoloration. Sight vane storage blocks are completely intact.

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