English horary quadrant, 1623-1700

Made:
1623-1700 in England

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English brass Gunter quadrant, 17th century (4-1/2 inch radius) with degree scale and shadow square. Unsigned but design, lettering and decoration identical to 1938-386.

This unsigned English horary quadrant was made during the latter part of the seventeenth century. Made of brass the quadrant has engraved scales to a design conceived by the English mathematician Edmund Gunter in 1623. The horary quadrant was 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 the Medieval Period. Like its predecessor it includes a two-dimensional depiction of the heavens that is reduced to a quarter.

Details

Category:
Astronomy
Object Number:
1889-51
type:
horary quadrant - gunter
taxonomy:
  • disciplines
  • disciplines
  • science
  • natural sciences
  • physical sciences
  • furnishing and equipment
  • measuring device - instrument
  • timepiece
  • horary quadrant
credit:
Taylor, C.P.