Epact Scientific Instruments of Medieval and Renaissance Europe

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Inclining Dial
Signed by Johann Christoph Keller
circa 1600; Linz
Brass and wood; 113 x 116 x 67 mm

The dial consists of a brass plate mounted on gimbals in a wooden case and can be adjusted for any latitude between 45 and 55? by means of a sliding counterpoise on the lower side of the plate.

At the centre of the dial is a compass, mounted on pivots to remain horizontal whatever the angle of the dial. The wooden case, with brass round feet, appears to be modern.

Museum of the History of Science, Oxford
Inventory number 35317

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