Grande bussola magnetica nautica inglese in ottone e vetro primi del ‘900

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About the Item

Grande bussola magnetica nautica in ottone e vetro, dei primi del ‘900, montata su tavola di legno di rovere e ottone realizzata su misura. Diametro bussola cm 24,5 – inch 9.4, altezza con base cm 21 – inch 8.3, larghezza tavola cm 36 – inch 14.2. Buono stato, piccola crepa sulla rosa dei venti. La bussola è costituita da un recipiente di forma cilindrica in ottone, chiamato mortaio, sul cui fondo è fissato uno stelo di metallo duro, chiamato elemento sensibile, sul quale è appoggiata la rosa dei venti opportunamente vincolata, in modo che lo zero coincida con la polarità magnetica. Per ridurre al minimo l’attrito, il mortaio è stato riempito di liquido a basso punto di congelamento, avente anche lo scopo di smorzare rapidamente le eventuali oscillazioni del complesso e chiuso superiormente da un robusto vetro di protezione. I primi accenni sull'uso in Europa di strumenti che sfruttavano la forza magnetica per orientarsi nella navigazione risalgono alla fine del XII secolo, soprattutto grazie alle conoscenze portate dai mercanti e dai navigatori arabi: ne troviamo cenni nell’opera di Alexander Neckam “De nominibus utensilium” e nelle opere di Guyot de Provins in cui la calamita viene definita “compagna del marinaio”. Anche nell’inventario di una nave siciliana del ‘200, la San Nicolò, si fa riferimento della presenza a bordo di una calamita e di una “bussola di ligno”. The first hints in Europe on the use of instruments using magnetic fields for orientation are dated back to the late twelfth century, especially thanks to the knowledge brought by merchants and sailors after contacts with the Arabs: we find hints in the work by Alexander Neckam "De nominibus utensilium" and in the works by Guyot de Provins, where the magnet is called "sailor's friend". Even the inventory of a Sicilian ship of 1200's, the San Nicolò, refers to the presence on board of a magnet and a "bussola di ligno", that is a wooden compass.

Dimensions:
Height: 8.3 in (21.09 cm)Diameter: 9.4 in (23.88 cm)
Materials and Techniques:
Brass
Period:
1900-1909
Date of Manufacture:
1900
Condition:
Wear consistent with age and use.
Seller Location:
Milan, IT
Reference Number:
1stDibs: LU1020236297432

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