Product images of Universal equinoctial ring dial
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Manufactured in the UK
All products are printed in the UK, using the latest digital presses and a giclée printmaking process.
We only use premium branded inks, and colours are independently verified to last between 100 and 200 years.
Universal equinoctial ring dial
Three-ring universal equinoctial ring dial for all latitudes. A thin ring slides inside the declination ring and carries a square with pinholes at each corner. Opposite the sights square is another square with four points indicating the places where the sun's rays should fall when the instrument is correctly aligned. This dial has an unusual transversal scale for the latitudes. It has been used to allow the small latitude scale to be divided more easily into single degrees. The ring inside the declination ring replaces the more normal alidade, which could also be used for measuring altitudes as well as showing the time of day. The quality of engraving is low, particularly on the words in the latitude table.
- Image reference: D8857
- National Maritime Museum, Greenwich, London