Surveying quadrant, 1674.

Made:
1674 in Rome and Italy
maker:
Francesco II d'Este
and
Jacobus Lusuerg

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group
© The Board of Trustees of the Science Museum

Surveying quadrant with sights, plotting scales and gunnery scale on the obverse, by J. Lusuerg, Rome, 1674

This quadrant, with sights, plotting scales and a gunnery scale on the obverse, was made in Rome by Jacob Lusuerg in 1674 and bears the coronet and arms of the Duke of Modena. Many members of the Lusuerg family in Rome were instrument makers, and several of them are represented in the Science Museum collections. A small version of an astronomical instrument, the gunnery quadrant measured vertical angles to give the altitudes of terrestrial objects and for setting artillery.

In its earliest form, the quadrant was used by astronomers to find the altitudes of the stars and planets. The reverse side of the instrument bears the coronet and arms of the Duke of Modena and a scale enabling the instrument to be used as an artillery quadrant.

Details

Category:
Surveying
Object Number:
1880-200
type:
surveying quadrant
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • theodolite
credit:
Fulgence, Mons. (Paris)