Sector
From Inventions
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| - | |descrizione= Measurement compass for arithmetical and geometric operations, for calculating inaccessible quantities and in particular for land surveying. The arms equipped with sights move, as in the [[altazimuth square]], on a semicircle bearing the degree scale. With the passage of time, the name "sector" has become synonymous with [[Proportional Compasses |proportional compasses]]. | + | |descrizione= Measurement compass for arithmetical and geometric operations, for calculating inaccessible quantities and in particular for land surveying. The arms equipped with sights move, as in the [["Squadra mobile" (folding square) |altazimuth square]], on a semicircle bearing the degree scale. With the passage of time, the name "sector" has become synonymous with [[Proportional Compasses |proportional compasses]]. |
|componenti= | |componenti= | ||
Revision as of 11:41, 27 July 2010
Name adopted or coined by the inventor to define his geometric compass similar to the altazimuth square. The name remained in use in England from the late sixteenth century on to indicate the proportional compasses.
Contents |
Inventor
Thomas Hood
Historic Period
1598
Description
Measurement compass for arithmetical and geometric operations, for calculating inaccessible quantities and in particular for land surveying. The arms equipped with sights move, as in the altazimuth square, on a semicircle bearing the degree scale. With the passage of time, the name "sector" has become synonymous with proportional compasses.
Bibliographical Resources
Hood, Thomas, The making and use of the gnomonical instrument called a sector, London, 1598.
Existing Instruments
Oxford, Museum for the History of Science, Inv. 44505
Author of the entry: Filippo Camerota
