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Sestante in ottone firmato B. Cooke & Son Hull della seconda metà del XIX secolo

$3,536.31List Price

About the Item

Sestante in ottone firmato B. Cooke & Son Hull, della seconda metà del XIX secolo e alloggiato nella sua scatola originale in legno di mogano con maniglia, cerniere e ganci di chiusura in ottone, completa di serratura con chiave . Lembo e verniero in argento, impugnatura in ebano, 3 vetri colorati per lo specchio fisso e 4 per quello mobile, quattro telescopi di cui uno lungo, 1 filtro, 1 chiave per la registrazione, verniero graduato da 0 a 150°, specchio d’indice e d’orizzonte. Un’etichetta di carta posta all’interno della scatola indica il nome di John Bliss riparatore di strumenti nautici a New York. Stato conservazione: buono, funzionante e completo di base per l’appoggio realizzata in legno e ottone su misura. Misure scatola cm 25,5x23,5x12,5 – inches 10x9.2x4.8. L'ultima foto è la confezione regalo. Barnard Cooke fondò la sua azienda attorno al 1863, dopo aver lavorato dal 1841 al 1853 con il fratello Thomas Cooke famoso costruttore di telescopi e orologi. La B. Cooke & Son vanta una gloriosa storia come costruttore e distributore di strumenti nautici. Il sestante è un antico strumento astronomico utilizzato per la misurazione dell’altezza di un astro (per esempio del Sole): si dispone lo strumento in un piano verticale e, guardando attraverso il dispositivo di mira, si traguarda la linea dell’orizzonte visibile attraverso la metà non argentata dello specchio fisso. Muovendo l’alidada, con la quale è solidale lo specchio, si fa in modo che i raggi luminosi provenienti dall’astro e successivamente riflessi dallo specchio mobile e dalla metà argentata dello specchio fisso vengano da quest’ultimo rinviati nella direzione di osservazione: se si guarda attraverso il dispositivo di mira si vede l’immagine dell’astro, ottenuta per doppia riflessione, coincidere con la linea dell’orizzonte. L’altezza dell’astro è espressa dall’angolo il cui valore viene letto sulla scala graduata. Il filtro viene utilizzato quando l’astro da traguardare è il Sole. Fu Sir Isaac Newton l'inventore del principi della doppia riflessione negli strumenti di navigazione, ma queste ricerche non furono mai pubblicate. Successivamente, due uomini, indipendentemente l'uno dall'altro, scoprirono il sestante attorno al 1730 : John Hadley (1682-1744), matematico inglese, e Thomas Godfrey, (1704-1749), inventore americano. Ma solo nel 1758 l’ammiraglio John Campbell effettuò in mare aperto una serie di prove per sperimentare un nuovo metodo che si basava sulla distanza lunare come mezzo per calcolare la longitudine. Fu così che venne messo a punto il sestante. Inizialmente prodotti in ottone, avevano scale divise con grande precisione dai matematici che fabbricavano strumenti scientifici.

Dimensions:
Height: 4.8 in (12.2 cm)Width: 10 in (25.4 cm)Depth: 9.2 in (23.37 cm)
Materials and Techniques:
Brass
Period:
1870-1879
Date of Manufacture:
1870
Condition:
Wear consistent with age and use.
Seller Location:
Milan, IT
Reference Number:
1stDibs: LU1020245203172

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