When the theoretically generated shapes of the after mould frames are superimposed on the recordings of the timber remains, the correspondence is excellent (Figure 48a–d). As with the midship frame, in all cases where there is any gap between the two types of curves it is the result of wane disturbing the contour of the frame shape or, in the case of the upper part of XIID's floor timber, a piece of timber broken off. The figures in this essay are published at a small scale, but the correspondence of the reconstructed design sections and the archaeological frame shapes is equally close at a large scale. This does not mean that in every detail the reconstructed method of drawing these frames is correct, but I believe it does come close to unraveling what were the basic procedures if not all the nuances. Nonetheless, it cannot be overemphasized that the introduction of additional longitudinal curves decreases the importance of the rules for drawing the transverse curves of the frames; therefore, the reconstruction procedures in Figure 47 should not be viewed pedantically.
The Forward Diagonals
As with the diagonals abaft the midship frame, the archaeology provides evidence of floor and upper bilge diagonals before the midship frame along with some of their offset measurements. The rest of the diagonals before the midship station had to be reconstructed on the basis of documentary evidence. In addition to the height of the floor diagonal, La Belle's devis provides only one enigmatic measurement for reconstructing the diagonals before amidships. The devis gives the height of the maximum beam forward as 13 ft 6 inches. Plotted in cross section, this results in an endpoint for the maximum beam diagonal well above the height of the stem (Figure 44b). This in itself is not unusual, because if the after breadth diagonal were extended upwards, its endpoint would also appear too high. However, this diagonal is cut off in the stern by the transom.
In both the Profond and Toulon flute drafts, all the diagonals forward, other than the floor diagonal, do not extend all the way to the stem (Figures 6, 7). In both these drafts all the diagonals terminate on the forwardmost designed frame. The full lengths of the floor diagonals are defined in these drafts simply because their endpoints are on the centerline timbers at the bottoms of both the forwardmost and aftermost design frames. Since La Belle's floor diagonals also terminate at the bottoms of frames XIIA and XVIIID, I believe frame XIIA serves as the termination point for all the diagonals forward (Figure 44b), just as the transom does for the diagonals aft (Figure 44a).
The difficulty with using design diagonals completely to the stem is that, unlike between all the other mould frames, the distance from the forwardmost design frame to the stem continuously increases the higher the diagonal is on the hull. This does not allow the diagonal lengths to simply be applied to the equilateral triangle to be subdivided into increments. NEXT
© 2014 TARAS PEVNY