Page 35

REVISTA DE HISTORIA NAVAL SUP 21

— la quilla inglesa de arqueo (130-3) (53) es 5/6 de la eslora, como la «de trazado» de Gaztañeta, y difiere mucho de la española de «codillo a codillo» citada en el Ms.10.790; — estas diferencias son notables y deben tenerse en cuenta en toda comparación; — especial importancia tiene la diferente longitud de la quilla real, que determina el lanzamiento. Por su importancia en las comparaciones que presentamos, transcribimos y comentamos aquí el texto repetidamente citado de Sutherland. General Method or Shipwrights Hall Rule. Tonnage = keel * Breadth * (Breadth/2) / 94 tons «Length of the keel, measured from the Back of the Main Post, to the Fore-side of the Stem, at the upper Edge of the lower Harping, by a Perpendicular made from thence to the upper or lower Edge of the keel, only 3/5 of the main Breadth, from the Outside of the Plank of one side to the Outside of the Plank of the other side, at the broadest Place of the Ship, being set backward or aftward from the Right Angle made by such a Perpendicular and Base. Observing also that as several Ships and Vessels have no false Post, in such a case there ought to be allowed 1/3 of the main Post from the after Part of such a Stern-Post. »But in taking the length para definir el extremo de proa de la quilla I have seen that in full ships they have taken it to the Extreme fore part of the Stem and set back 3/5 of the Breadth from thence». Comentarios: — la quilla de arqueo no depende de la quilla real; — aunque dice la «lower harping» (la vagara inferior), en la figura que acompaña para explicarlo se representa la cinta y se toma el borde más a proa de la roda, arriba; — «as for the Rake of the Stern Post, it was the Opinion and Custome of Old Mr Shish and his sons, all Eminent Builders, for every perpendicular height of the Stern post, to set a Inches & 1/8 aftward, which will make A Comely Rake or Rombus». Es decir, caída del codaste = 1,125/12 = 9,37 por 100. (53) wINFIELD, p. 52 34 SUPLEMENTO N.º 21 A LA REVISTA DE HISTORIA NAVAL. Núm. 128


REVISTA DE HISTORIA NAVAL SUP 21
To see the actual publication please follow the link above