Barrois' Compasses

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	{{Template invention		{{Template invention
-	|nome= Nome coniato dall'inventore ("compas Barrois")	+	|nome=
		+	Name coined by the inventor ("compas Barrois").
-	|inventore= François Barrois.	+
		+	|inventore= François Barrois
	|data= 1598		|data= 1598
-	|descrizione= Strumento composto da due diottre graduate incrociate che assumono la forma di un doppio compasso di proporzione o di una doppia squadra zoppa. Su una delle gambe scorre un cursore sul quale è incernierato un braccio graduato trasversale munito di traguardi. Lo strumento serviva a misurare gli angoli interni ed esterni di un edificio, a costruire i poligoni regolari, a misurare altezze e distanze, e a compiere rilevamenti topografici.	+	|descrizione=
		+	Instrument composed of two intersecting graduated diopters that take the shape of double proportional compasses or a double folding square. On one leg slides a cursor to which is hinged a graduated perpendicular vane with sights. The instrument served to measure the internal and external angles of a building, construct regular polygons, measure heights and distances, and conduct surveying work.
	|componenti=		|componenti=

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Revision as of 09:01, 13 November 2009

Name coined by the inventor ("compas Barrois").

Contents 1 Inventor 2 Historic Period 3 Description 4 Bibliographical Resources 5 Existing Instruments

Inventor

François Barrois

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Historic Period

1598

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Description

Instrument composed of two intersecting graduated diopters that take the shape of double proportional compasses or a double folding square. On one leg slides a cursor to which is hinged a graduated perpendicular vane with sights. The instrument served to measure the internal and external angles of a building, construct regular polygons, measure heights and distances, and conduct surveying work.

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Bibliographical Resources

Barrois, Francois. La fabricque et quelques traits plus sommaires de la practique du compas Barrois, le plus facile, le plus prompt et le moindreen frais de tous les instrumens qui ont presentement bruit a l'usage de geometrie. A Paris, chez Iacques Le Roy, 1598.

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Existing Instruments

Florence, Museo Galileo. Institute and Museum of the History of Science, Inv. 656

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Author of the entry: Filippo Camerota