File:Treatise on marine and naval architecture, or, Theory and practice blended in ship building. Illustrated with more than 50 engravings (1852) (14583025308).jpg

Identifier: treatiseonmarine00grif (find matches)
Title: Treatise on marine and naval architecture, or, Theory and practice blended in ship building. Illustrated with more than 50 engravings
Year: 1852 (1850s)
Authors: Griffiths, John W. (John Willis), 1809-1882
Subjects: Naval architecture
Publisher: New York : D. Appleton
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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e. Hence itis apparent, that the half-breadth line,and the base-line forming the side of thetriangle, has the acute angular con-nection at each end, while each of theother two sides of the triangles connectwith each other at one termination andform right angles, and at the other con-nect with the half-breadth and base-lines respectively. Hence it follows,that we have only to find the properrelation the breadth and depth bear toeach other ; and from the outboard cor-ner of the body half-breadth, extend thehalf-breadth of the dead-flat frame an-gularly inward ; the line at the sametime forms an angle of 90 degrees, withanother line running in the direction ofand terminating at the connection ofthe middle and base-lines. In likemanner the heights of water and sheer-lines form a triangle kind of scale onthe outside, or halt-breadth line. Inthe triangle of heights a parallel line isextended from the half-breadth line tothe side of its diminished grade, onwhich all the actual heights may be
Text Appearing After Image:
MARINE AND NAVAL ARCHITECTURE 233 seen, as in Plate 14. So also with thehalf-breadths; they take theirdeparturefrom the base-line, and ran parallelwith the outer side of the triangle,meeting the half-breadth side, in regu-lar order. Thus we see that the in-board side of the lower triangle showsthe half-breadths, and the lower side ofthe upper triangle shows the severalheights respectively, as shown in Plate14. The diminished length is obtainedin the same manner as we have shownin our own expositions. The reader scarce needs a singleword from us on the comparative mer-its of those two methods of enlargingand reducing- drafts or models, retain-ing at the same time the same identi-cal shape. If the first method we havedescribed were adopted, we would nothesitate to make the alteration on thefloor of the mould-loft after the vesselwas laid down. We, however, canscarcely conceive that such a contin-gency would occur, unless it were de-termined to increase or diminish thesize of the vessel

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