From Inventions
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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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| - | |autore_scheda= Filippo Camerota
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| - | |categoria_1= Measuring instruments
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| - | |italiano= Tetrante
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| - | }}
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Current revision as of 08:03, 27 July 2010
