A RARE SILVER STRING GNOMON HORIZONTAL DIAL, signed LeMaire Fils A Paris, mid 18th century, rectangular, inset with compass incorporating lock and declination indicator, raised on four leveling screw feet, the folding support for the gnomon engraved with the degree scales for each of the chapter rings, engraved with gazetteer on the reverse, (lacking leveling plummet)--3½in. (8.9cm.) long