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{{Template invention |nome= Name currently used for the [[Reduction Compasses | reduction compasses]]. |inventore= |data= |descrizione= Also called [[Double Compasses | double compasses]] or "compass with double points" (Muzio Oddi, ''Fabbrica et uso del compasso polimetro'' [Construction and operation of the polymeter compass] Milan 1633, introduction), the instrument was used as a [[Proportional Compasses | proportional compasses]], for measuring simple proportional ratios, or as a [[Reduction Compasses | reduction compasses]] to enlarge or reduce drawings. The compass was composed of two intersecting legs with points on all ends and a fixed or variable pivot depending on the proportional ratios desired. Ancient examples of this instrument have been found in the excavations of Pompeii. |componenti= |riferimentibibliografici= |strumentiesistenti= - Museo Galileo, Institute and Museum of the History of Science, Florence <br> [http://catalogo.museogalileo.it//oggetto/CompassoProporzioneQuattroPunte.html Florence, Museo Galileo. Istituto di Storia della Scienza, inv. 3567] <br /> |link= |immagini= |autore_scheda= Filippo Camerota |categoria_1= Measuring instruments |categoria_2= |categoria_3= |categoria_4= |categoria_5= |categoria_6= |categoria_7= |categoria_8= |categoria_9= |categoria_10= |italiano= Compasso a quattro punte }}

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