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Contamiglia nautico in ottone a forma di fiocina W. Pilley Co Makers 1870 circa
About the Item
Log o solcometro contamiglia nautico in ottone a forma di fiocina, firmato W. Pilley & Co Makers Birmingham , della seconda metà dell’ 800. Si tratta di un antico strumento nautico, molto raro e dalla forma caratteristica, che misurava la distanza e la velocità di una nave. Veniva gettato fuori bordo e trascinato dietro la nave stessa; ruotando grazie alla sua elica, trasmetteva il numero di giri fatti su se stesso ai tre quadranti realizzati su una placca in metallo smaltato posta al centro del log; i quadranti riportavano le misurazioni in miglia da 0 a 100 in decine, da 0 a 10 in unità, da 0 a 1 in quarti. I dati venivano poi letti ogni ora per ricavare anche la velocità. Buono stato perfettamente funzionante e montato su base in legno e ottone realizzata su misura.
Misure lunghezza cm 55x13x13- inches 21.7x5.1x5.1.
L'ultima foto è la confezione regalo.
Nei secoli passati il tentativo di misurare la velocità delle navi era fortemente ostacolato soprattutto dall’ indisponibilità di strumenti per la misura del tempo di sufficiente precisione: gettando un pezzo di legno in mare dalla prua di una nave e misurando il tempo che questo impiegava per arrivare a poppa, era possibile ottenere qualche informazione sulla velocità della nave stessa, ma con molti errori e imprecisioni. Il principio del solcometro meccanico fu illustrato alla Royal Society nel 1699 da Robert Hooke, ma il primo modello prodotto per uso commerciale venne brevettato solo nel 1802 da Edward Massey zio di Thomas Walker che gli subentrò nell’attività.
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