A rare circular slate sundial by Richard Melvin, mid-19th century, multi-dial calibrated with a central principal dial with a pierced gnomon calibrated with hours and world cities, flanked by eight subsidiary dials calibrated with countries and signed 'Richard Melvin, maker to the Crystal Palace Co, London', on an associated composition stone pedestal, dial 55cm diameter, 24cm high pedestal 36cm high Provenance: The Betty and Barry Power Collection.