Polimeter

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|nome= Nome coniato dall'inventore
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|descrizione= [[Compasso di proporzione]] a gambe piatte elaborato dal matematico urbinate Muzio Oddi come variante del [[compasso geometrico e militare]] di Galileo. Come lo strumento galileiano, il compasso polimetro contiene sette linee proporzionali che si distinguono dal modello di riferimento essenzialmente nel nome: le linee "feconde" per la divisione delle rette in parti uguali, le linee "inscritte" per la divisione delle circonferenze, le linee "emballiche" per costruire poligoni regolari della stessa area, le linee "sferaliche" per determinare il rapporto tra diametro e peso di palle della stessa materia, le linee "metalliche" per i rapporti tra palle di diversa materia, le linee "steromiche" per determinare i lati dei cinque corpi regolari, e il "calibro", ovvero una linea uguale al diametro di una palla di stagno di 38 libbre.
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[[Proportional Compasses | proportional compasses]] with flat legs designed by the mathematician from Urbino Muzio Oddi as a variant of Galileo's [[Geometric and Military Compasses | geometric and military compasses]]. Like Galileo's instrument, the polymetric compass is engraves with seven proportional lines differing from their predecessor basically in their names: "fecund" lines for dividing straight lines into equal parts "inscribed" lines for dividing circumferences, "emballic" lines for constructing regular polygons having the same area, "spheralic" lines to determine the ratio between the diameter and weight of balls made of the same material, "metallic" lines for ratios between balls made of different material, "steromic" lines to determine the sides of the five regular bodies, and the "caliber", a line equal to the diameter of a ball of tin weighing 38 pounds.  
|inventore= Muzio Oddi (1569-1639)
|inventore= Muzio Oddi (1569-1639)

Revision as of 12:22, 13 November 2009

Nome coined by the inventor.

Contents

Inventor

Muzio Oddi (1569-1639)

Historic Period

1633

Description

proportional compasses with flat legs designed by the mathematician from Urbino Muzio Oddi as a variant of Galileo's geometric and military compasses. Like Galileo's instrument, the polymetric compass is engraves with seven proportional lines differing from their predecessor basically in their names: "fecund" lines for dividing straight lines into equal parts "inscribed" lines for dividing circumferences, "emballic" lines for constructing regular polygons having the same area, "spheralic" lines to determine the ratio between the diameter and weight of balls made of the same material, "metallic" lines for ratios between balls made of different material, "steromic" lines to determine the sides of the five regular bodies, and the "caliber", a line equal to the diameter of a ball of tin weighing 38 pounds.

Bibliographical Resources

Oddi, Muzio. Fabbrica et uso del compasso polimetro, appresso Francesco Fobella, Milano, 1633.


Author of the entry: Filippo Camerota

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