COMPAS DE PROPORTION, dit demi-pied de Roy, Ancienne Monarchie.

Photo 3 : COMPAS DE PROPORTION, dit demi-pied de Roy, Ancienne Monarchie.

Photo 4 : COMPAS DE PROPORTION, dit demi-pied de Roy, Ancienne Monarchie.

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COMPAS DE PROPORTION, dit demi-pied de Roy, Ancienne Monarchie.

Instrument de mesure composé de deux réglettes unies entre elles par une charnière déployant les réglettes à angle droit. Les réglettes sont signées Demi-pied de Roy.
Longueur de chaque réglette 17,4 cm.

France.
Ancienne Monarchie.
Très bon état.

NOTE
Avant l'instauration du mètre et du kilogramme, qui eut lie à la Révolution française, il existait une multitude d'unités de mesures complexes et non-homogènes. D'où l'expression du XVIII° « avoir deux poids et deux mesures ». Les unités de longueur se basaient par exemple sur le corps, les pieds, les coudes, les pouces, les paumes…

Reference : 21838-2

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