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and early example
Both included in their original wood cases
This highly sensitive instrument was often used in photometry and hygroscopy
Dimensions: 8
Early 'Heliochron' Pantochronometer trial frame and early exampleA Rare early 19th century Pantochronometer hand engraved 'HELIOCHRON' on lid. Complete original. Dome cased brass sundial compass with floating paper face and fixed brass gnomon. Pantochronometers were first developed in the late 1700's, and widely popularized in 1820 by Samuel Porter. A fine, functional, scarce, and early example. Circa 1830. Diameter: 4. 5 cm. Height: 3 cm. Weight: 1. 7 oz.
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