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History of Science Museum

Astronomical Alarm Clock, by Grimaldi & Johnson, London, Early 19th Century

Inventory Number 50110


Item type
Object
Provenance
Made for the Radcliffe Observatory.
Primary inscriptions
"Radcliffe Observatory | OXFORD | Grimaldi & Johnson | STRAND LONDON" engraved on plate attached to lower front of case.
Physical material
? Brass. Case: ebony.
Object type
Clock
Dimensions
Height: 126mm Width: 270mm Depth: 237mm Weight: 5kg
Inventory No
50110

Description

Revolving 24-hour dial; time is indicated by the projection on the small brass plate at the top of the dial. This plate is engraved with a type of vernier scale for accurate readings. The alarm is actuated by small screws with projections at the end which are screwed into the appropriate tapped holes in the dial. The alarm mechanism is wound by pulling the cord at the side of the clock. Ebony case.