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Heller & Brightly Surveyor's Transit with Original Mahogany Case

This is a significant 19th-century scientific instrument, specifically a surveyor's transit or theodolite, manufactured by the renowned firm Heller & Brightly of Philadelphia. The instrument is constructed primarily of brass with some blackened components. It features a long longitudinal telescope mounted above a horizontal spirit level, with a vertical graduated circle and vernier scales for precise angular measurement. The brass shows a heavy, dark natural patina and some oxidation consistent with field use in the late 1800s. The instrument is housed in its original fitted mahogany transport case, which stands approximately 20 inches high. The interior of the case lid retains two original paper labels: one is a prominent trade label for 'Heller & Brightly, Mathematical, Surveying, Astronomical, Optical and Engineering Instrument Manufacturers' located at the southeast corner of Spring Garden and Ridge Avenue in Philadelphia; the second is a partial 'Price List' from the same firm. The case shows significant wear, including wood loss on the edges, surface abrasions, and aging of the finish. The interior includes wooden blocks custom-fitted to secure the specific components of the transit. Heller & Brightly was founded in 1870, so this piece likely dates to the final quarter of the 19th century. The presence of the original trade labels and the undisturbed patina on the brass are major quality and provenance indicators that would be vital for museum-grade appraisal.

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$1,800 - $2,500

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