Description

SOLD – An exceptionally rare equinoctial half circle ring dial by Dollond. The horizontal base measures  5 inches ( 12.8 cm ) across and holds two intact bubble levels and is supported by three levelling screws. The half circle measures just over 6″ ( 15.5 cm ) and is engraved from o – 90 in both directions (North & South) with the inner ring swinging out 90 degrees and engraved with hours. The top slider with peep hole and engraved with months of the year and zodiac signs. The whole half circle is able to move 180 degrees on the central support.

Very nice condition noting one screw head missing  to one of the support bars of the slider.

Circa 1800. Height 5″ ( 12.5 cm ).  I have been unable to locate a similar instrument anywhere on the internet (though there is another one here on Fleaglass).