Sun-dial, brass, for sidereal and ordinary time st | Science Museum Group Collection
Universal equinoctial sundial, torquetum-type. Brass; for sidereal and ordinary time. Stands 6" high. Date Made: c.1671-1700.

Whirly Doodle
Polyhedral Sundial
"The Museum of the History of Science, Oxford has a polyhedral sundial in the shape of an octagon that has been attributed to Nicolas Kratzer: The sundial made about 1425 for Cardinal Wolsey. The four-sided base has Wolsey's arms, the arms of York Minster, and (on two sides) a cardinal's hat." My take: Some of the dials look decidedly iffy. It would be interesting to see this piece close up.
Art Resource
Astrolabe, 1574. The mater bears the markings for a Quadratum Nauticum ('nautical square'), used by mariners for navigational calculations, and the back shows the universal projection as described by Gemma Frisius in his treatise on the 'Catholic Astrolabe' in the mid-sixteenth century. Made by Humphrey Cole
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