Bras horary quadrant, 1549.

Bras horary quadrant, 1549.
4 0 c m
actual image size: 26cm x 32cm


This electrotype copy of rectangular horary quadrant was made by Georg Hartmann (1489-1564) in Nuremberg, Germany. Horary quadrants were used for finding local time by sighting either the Sun or a bright star at night. Held vertically, a measurement could be taken from the position on the scale of a moveable bead on the thread of the instrument's plumb bob. The instrument was derived from the astrolabe and first appeared during Medieval times. Like its predecesor, it includes a two-dimensional depiction of the heavens that is reduced to a quarter. This reverse view shows extra timekeeping scales.

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© Science Museum / Science & Society Picture Library

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