Tetrantis

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{{Template invention
 
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|nome= Name in use since Roman times, derived from ''tetrantis'' (quadrant).
 
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|inventore= Marco Iunio Nipso
 
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|data= V-VI d.C.
 
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|descrizione= Square-shaped instrument for measuring the width of a river (''fluminis varatio'') described by Marcus Junius Nupsus (F. Blume and others, 1967, pp. 285-286). The measuring method is similar to the one attributed to Thales of Miletus, used to calculate the distance of a ship from the coastline. In both cases the lines of sight extending from two points along a line parallel to the coast or the riverbank were prolonged on the terrain behind the surveyor, to form a triangle similar or equal to the one having as base the aforesaid line and as vertex the point sighted. A similar instrument serving the same function was described in the eighteenth century by V. de Honnecourt (fol 20r).
 
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|componenti=
 
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|riferimentibibliografici=''Die Schriften der Römischen Feldmesser''. Herausgegeben von Friedrich Blume, Karl Lackmann, Adolf August Friedrich Rudorff. Hindesheim, Georg Olms Verlagsbuchhandlung, 1967, pp. 285-286.<br />
 
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Villard de Honnecourt, ''Album di disegni''. Biblioteca Nazionale di Parigi, ms.19093, c.20r.<br />
 
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Villard de Honnecourt. ''Kritische Gesamtausgabe des Bauhüttensbuches ms. fr. 19093 der Pariser Nationalbibliotek''. Herausgegeben von Hans R. Hahnloser. Wien, A. Schroll, 1935.
 
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|strumentiesistenti=
 
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|link=
 
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|immagini= <gallery widths=230 heights=368 perrow=3>
 
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Image: Filippo.jpg
 
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</gallery>
 
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|autore_scheda= Filippo Camerota
 
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|categoria_1= Measuring instruments
 
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|italiano= Tetrante
 
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}}
 

Revision as of 10:33, 20 July 2010

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