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Equinoctial Ring Dial, by Joseph Jackson, London, 18th Century

Inventory Number 79482

Acknowledgement: © History of Science Museum, University of Oxford, inv.79482

Item type
Object
Provenance
Presented by Lewis Evans with his collection.
Primary inscriptions
"Josph Jackson London".
Physical material
Brass; mahogany box
Object type
Equinoctial ring dial
Dimensions
Diameter: 152mm
Inventory No
79482
Accession Number
1924-0/part

Description

Brass, with Northern and Southern latitude scales; the slide attached to the suspension ring is engraved with a type of vernier scale for accurate adjustment.

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