. The autobiography of Phineas Pett. dshipsection as in the drawing annexed. In thisdrawing we have: Ft. Insi AB = the half breadth . . 23 3AC = the depth from greatest breadth to top of keel . . 19 4AD = the half flat of the floor . .70DE = the radius of the runghead sweep . noFG = the radius of the sweep betweengreatest breadth and the water-line 10 o FH = the radius of the sweep above the breadth . . 14 o We can now plot the curve of the section:Drawing the arc FI with radius GF to a depth of3 feet perpendicularly below CF, we obtain thepoint I, and producing IG backwards to K, apoint 31 fe
. The autobiography of Phineas Pett. dshipsection as in the drawing annexed. In thisdrawing we have: Ft. Insi AB = the half breadth . . 23 3AC = the depth from greatest breadth to top of keel . . 19 4AD = the half flat of the floor . .70DE = the radius of the runghead sweep . noFG = the radius of the sweep betweengreatest breadth and the water-line 10 o FH = the radius of the sweep above the breadth . . 14 o We can now plot the curve of the section:Drawing the arc FI with radius GF to a depth of3 feet perpendicularly below CF, we obtain thepoint I, and producing IG backwards to K, apoint 31 feet distant from I, we have the centreof the futtock sweep, or sweep at the right ofthe mould, which is given as 31 feet in this radius from K we draw the arc ILcutting a line drawn from K through E at UOn drawing the runghead sweep from D withradius of 11 feet froni centre E, it is found thatthis arc meets the other precisely at L, and thesetwo arcs reconcile,* are tangent to each other XCVl INTRODUCTION. ? . T I? f f Scale of ,o , F . (^ . ??» . .6 ^o. V. ^^ a,8 t,a . y*. INTRODUCTION xcvii at L, for the centres of both arcs he in the samestraight hne KEL. The curve of the topsides presents moredifficulty, because we are only given the radiusof the sweep above the breadth/ but if weassume that the distance CM, or total heightof the midship section above the greatest breadth,is equal to AC (and this seems to have been thecustomary proportion), and that the reverse curveNO was struck with the same radius as FN,namely 14 feet, we get a curve for the half mid-ship section ADLIFNO which cannot be farfrom the original design, and in the lower portionmust approximate to it very closely indeed. There are no data from which the plan orelevation can be constructed, but it may benoted that the list in the State Papers alreadyquoted gives the length of keel as 137 feet, althoughthe tonnage remains as fixed by Pennington, sothat, presumably, the rakes of the stem- a
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Keywords: ., bookcentury1900, booksubjectgreatbritai, booksubjectshipbuilding
