A Richard Spear Universal Equinoctial Dial, Irish, early 19th century,signed Spear Dublin, with silvered compass rose, hinged latitude arc, hour ring and pierced gnomon,
3 1/4in (8.2cm) diameter FootnotesThere were two mathematical instrument makers named Richard Spear registered in Dublin between 1791 and 1837.
Literature:
cf. Gloria Clifton, Directory of British Scientific Instrument Makers 1550-1851.
A Richard Spear Universal Equinoctial Dial, Irish, early 19th century,signed Spear Dublin, with silvered compass rose, hinged latitude arc, hour ring and pierced gnomon,
3 1/4in (8.2cm) diameter FootnotesThere were two mathematical instrument makers named Richard Spear registered in Dublin between 1791 and 1837.
Literature:
cf. Gloria Clifton, Directory of British Scientific Instrument Makers 1550-1851.
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