Graphometer

From Inventions

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	{{Template invention		{{Template invention
-	|nome= Nome coniato dall'inventore derivandolo dal greco ''grapho'' (descrivere, dipingere, disegnare) e ''metron'' (misura).	+	|nome= Name derived by the inventor from the Greek ''grapho'' (to describe, to paint, to draw) and ''metron'' (measure).
	|inventore= Philippe Danfrie		|inventore= Philippe Danfrie
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	|data= 1597		|data= 1597
-	|descrizione= Strumento descritto da Philippe Danfrie che può essere visto come una mezza [[bussola]]. L'ago magnetico e la [[diottra]] si trovano infatti al centro di un semicerchio con la scala dei gradi, innestato su una base fissa munita di traguardi. Nel misurare le distanze ed eseguire un rilevamento territoriale, lo strumento necessita di due stazioni il cui allineamento è controllato attraverso i traguardi della base fissa. La diottra misura gli angoli di posizione che vengono successivamente trascritti sulla carta.	+	|descrizione= Instrument described by Philippe Danfrie, which may be seen as a half [[compass]]. The magnetic needle and the [[diopter]] are found in fact at the centre of a semicircle with a degree scale, attached to a fixed base that carries sights. For measuring distances and surveying territories, the instrument requires two stations, whose alignment is verified through the sights on the fixed base. The diopter measures the position angles, which are later transcribed onto charts.
	|componenti=		|componenti=

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Revision as of 09:54, 26 July 2010

Name derived by the inventor from the Greek grapho (to describe, to paint, to draw) and metron (measure).

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

Inventor

Philippe Danfrie

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Historic Period

1597

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Description

Instrument described by Philippe Danfrie, which may be seen as a half compass. The magnetic needle and the diopter are found in fact at the centre of a semicircle with a degree scale, attached to a fixed base that carries sights. For measuring distances and surveying territories, the instrument requires two stations, whose alignment is verified through the sights on the fixed base. The diopter measures the position angles, which are later transcribed onto charts.

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Bibliographical Resources

Danfrie, Philippe. Déclaration de l'usage du graphomètre par la pratique duquel l'on peut mesurer toutes distances des choses de remarque qui se pourront voir et discerner du lieu ou il sera posé et pour arpenter terres, bois, prés et faire plans de villes et forteresses, cartes géographiques et généralement toutes mesures visibles, et ce sans règle d'arithmétique..., A Paris, chez ledict Danfrie, 1597.

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Existing Instruments

Firenze, Museo Galileo. Istituto e Museo di Storia della Scienza, Inv. 151.
Firenze, Museo Galileo. Istituto e Museo di Storia della Scienza, Inv. 3630.
Firenze, Museo Galileo. Istituto e Museo di Storia della Scienza, Inv. 3699.

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Author of the entry: Filippo Camerota