A large universal brass equinoctial ring sundial bearing the signature "Heath & Wing London" and datable around 1760. According to Clifton, Thomas Heath and Tycho Wing were partners and manufacturers of scientific instruments in London between 1751 and 1773. The ring measures 15.7cm in diameter (around 6 inches) and 22cm (8.5 inches) with its nice and large ring. The meridian circle, the larger of the two rings, is engraved on one of its two faces with two 90-degree scales for the north and south latitudes.On the other side, a scale to measure the height of the sun (divided from 0 to 90 degrees and vice versa) has, at its top, a hole to insert a gnomon. The large decorative ring and its slider are adjusted by sliding. The equinoctial circle bears, on its flat part, the hours scale (two scales of I-XII, divided every 5 minutes) and on its edge the same scale also divided every 5 minutes. In the axis of the poles, the diametral blade, with an "N" and an "S", is graduated with the solar declination scale and with a zodiacal scale; then on the other side is the calendar scale. The orifice to receive the sun's rays slides along these scales. Good condition and perfect working order. Beautiful ring, of large, from the middle of the 18th century. This item is in the category "Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Other Antique Science Equip". The seller is "lezograscope" and is located in this country: FR.
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