repair, restoration & sales of

Antique Surveying Instruments

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Restoration Services

Compass Restoration

We properly restore the functionality, as well as the original beauty, of early surveying instruments. It is our intention to honor the colonial craftsman by adhering to their standards.

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Microscope Restoration

We offer repair and replication of missing pieces on 18th and early 19th century microscopes. We have access to a thorough database of original microscopes and ancillary items as models for replicas.

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Clock Dial

The vast majority of 18th century brass face, tall case clocks have had the silvered dials polished off. We successfully replicate the original silvering process using 18th century materials.

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Instruments for sale


Mason Essex Bridge Compass

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Wooden Semi-Circumferentor


Houghton Copy Theodolate

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Ramsden-Style 4-Vane Theodolite

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Installation of the David Rittenhouse Transit Telescope to an Existing Window Bracket on the American Philosophical Society Building

After having completed several restorations on instruments owned by the American Philosophical Society, I was appointed to the Committee on Museum to review the condition of current instruments in its collection and to contribute to the vetting process of new acquisitions. After the 2015 American Philosophical Society Committee on Museum meeting, Chairman Keith Thomson brought […]

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