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ca 1820-1840, by Spencer, Browning & Rust, London, and sold by D. McGregor & Co., Glasgow and Greenock. It has an ebony frame with engraved ivory maker`s label Spencer Browning & Rust London, full set of index and horizon filters, brass index arm with ivory vernier, ivory plate for recording readings set into the back of the instrument, and brass eyepiece with pivoting peep. The inlaid ivory scale is marked in 20 arc minute increments from 0 to 95 degrees and is signed in script SBR. The instrument is housed in the original stepped, hand-made oak box retaining much of its original gilt, iron red and black pin-striping and paint and its original lock, fancy brass escutcheon and hook and eye closures. Inside the lid is the retailer`s trade label reading D. McGregor & Co. / Manufacturers of Nautical, Mathematical & Optical / Instruments / Chronometers & Watches / 38 Clyde Place, Glasgow & 8 William Street, Greenock. The instrument itself measures 11` high on the index arm with the same dimension across the large arc. The case measures 4.25` high x 15` long x 13` across the long arc.

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