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Image: Dotze Crestia Valencia 1484

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Description: First written reference of the use of a marine sandglas for dead reckogning navigation: " La dotzena és quel alguatzir de cascuna galea faça observar les guaytes acostumades de nits e de dies. E si lo nauxer és diligent deu bé guardar les hores en popa e daquell qui les guarda per cosia. Per guisa que sapìen lo temps qui passa quan és en quan van o quan tornen atràs e així de les altres circumstàncies."
Title: Dotze Crestia Valencia 1484
Credit: http://www.antiblavers.org/galeria/albums/userpics/10223/Dotz%C3%A8_Cresti%C3%A0_Lambert_Palmart_Val%C3%A8ncia_1484-3.pdf#page=81
Author: Francesc Eiximenis
Permission: (Multi-license CC-BY-SA-3.0 and GFDL)
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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