A brass navigational and surveying instrument of circular form, designed as a natural sine compass. The top surface features a rectangular brass plate secured by four screws, engraved with a mathematical conversion table for natural sines. The plate is vertically inscribed NATURAL SINE to the left and STANLEY LONDON to the right. The instrument is equipped with an external brass-encased spirit level vial and a folding sighting mechanism attached to the side. It is housed in a custom-fitted square wooden storage box, likely mahogany or rosewood, featuring brass corner reinforcements, a swivel-hook latch, and a centrally inlaid brass anchor motif on the lid. This item is characteristic of modern maritime reproductions inspired by historical scientific instruments from W.F. Stanley & Co.
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