Astronomical Clock by J. Crosthwaite

Astronomical Clock by J. Crosthwaite, Dublin. c.1780s.
The clock was constructed for Dr Ussher of Dunsink Observatory. On Ussher's death it was purchased for Armagh Observatory for 40 guineas. The clock has rubied pallets, an eight-day movement, and rated at mean solar time. This clock was attached to a stone pillar in the passage to the transit room. (see Earnshaw's Astronomical Timepieces, M129)

Last Revised: 2009 November 18th