Product images of Universal equinoctial ring dial
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Universal equinoctial ring dial
Universal equinoctial ring dial for latitudes 0-90 north. The dial is for northern latitudes only and the degree scale on the meridian ring is divided clockwise from top -. The remainder of the obverse and reverse sides are filled with a table of latitudes primarily consisting of places in Italy. On the equinoctial ring, there is a main hour scale and the table of latitudes is continued. A rotatable ring on the inner rim carries an Italian hours scale. There is a date scale, but no declination scale and the equinoxes are given at 20 March and 22 September. There is elaborate leaf engraving on the stops and bridge ends. The stops for the equinoctial ring have additional hinged stops, which fold down once the equinoctial ring is in place to lock it in position. This rather heavy dial is even more ornately decorated than the other French dials of this type. The rotatable innermost ring carrying Italian hours is very unusual, and, combined with the large number of Italian towns listed, suggests that the instrument was made for an Italian or a Frenchman who travelled extensively in Italy. It is signed 'Butterfield AParis' on the obverse side of the meridian ring.
- Image reference: F2497-1
- National Maritime Museum, Greenwich, London, Georges Bernard Collection