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Bussola a liquido su giunto cardanico e montata su tavola di legno di mogano

$1,317.51
£976.35
€1,100
CA$1,798.66
A$2,000.93
CHF 1,048.91
MX$24,450.90
NOK 13,356.61
SEK 12,573.40
DKK 8,375.30
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About the Item

Bussola a liquido su giunto cardanico e montata su tavola di legno di mogano sagomata. Manifattura inglese della fine del XIX sec. La bussola è costituita da un recipiente di forma cilindrica in ottone e rame, sul cui fondo è fissato uno stelo di metallo duro, sul quale è appoggiata la rosa a otto venti e completa di cerchio goniometrico opportunamente vincolata, in modo che lo zero coincida con la polarità magnetica. Buono stato, leggermente usurata la rosa dei venti perfettamente funzionante. Per ridurre al minimo l’attrito, il mortaio viene riempito di liquido a basso punto di congelamento, avente anche lo scopo di smorzare rapidamente le eventuali oscillazioni e chiuso superiormente da un robusto vetro di protezione. Diametro bussola cm 13 – inch 5.2, misure tavola cm 10,5x17,2 – inch 4.2x6.7, altezza cm 13 – inch 5.2. I Greci e i Romani ignoravano ancora la possibilità di sfruttare i campi magnetici per orientarsi, mentre pare che questa possibilità fosse già in qualche modo nota ai Cinesi: intorno al 2600 a.C. l’imperatore Hoang-Ti riuscì a vincere in battaglia il principe Tchi-Yeou grazie a un carro “magico”, il See-Nan (carro indicante il sud). L’imperatore, grazie a questo congegno, individuò la via di fuga del nemico, nonostante il nemico l’avesse occultata tramite una coltre di fumo: sul carro era fissata una sagoma di forma umana di legno che ruotava su se stessa e che, con il braccio teso, puntava sempre verso sud (indicando il sud ovviamente era indicato nello stesso tempo anche il nord, ma il sud era considerato dai Cinesi il punto cardinale più importante). I Cinesi utilizzarono le loro scoperte relative ai campi magnetici anche come forma di intrattenimento e di spettacolo: lanciavano delle frecce magnetizzate come fossero dei dadi, e queste si allineavano in direzione sud-nord come per magia, cosa che impressionava e stupiva moltissimo gli spettatori.
  • Dimensions:
    Height: 5.2 in (13.21 cm)Diameter: 5.2 in (13.21 cm)
  • Materials and Techniques:
  • Period:
  • Date of Manufacture:
    1890
  • Condition:
    Wear consistent with age and use.
  • Seller Location:
    Milan, IT
  • Reference Number:
    1stDibs: LU1020236297272

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