File:Treatise on marine and naval architecture, or, Theory and practice blended in ship building. Illustrated with more than 50 engravings (1852) (14583024549).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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n this chapter,and although plain in itself considered,yet in its connection with the distinc-tive lines necessary for the delineationsof the frames or transverse sections ofthe ship when chocks are introduced,the subject seems to demand more thana passing notice. There are three kinds of moulds bywhich a ships frame may be moulded,only two of which, however, shouldhave any connection with the ship-yard ; those of the denomination wewould exclude are very properly calledskeleton moulds, and are better adapt-ed to the live-oak hammocks of thesouthern sea-board, although (theyhave been, and still are,) used in ourNavy yards for moulding the frames ofships, and such other vessels as arethere built. If an exposition is required of theinconvenience of skeleton moulds, wehave but to refer to the floor mould ofprivate yards, which is usually madeupon this principle. This mould iscommonly made in such a manner thatit is capable of containing all the floorsof the fore-body on the one side, and
Text Appearing After Image:
MARINE AND NAVAL ARCHITECTURE. 281 those of the after-body on the other.It is formed of battens, and dividedinto two parts, both of which are as-sumed to be alike, and each part hav-ing for its boundary line the middle-line as a vertical boundary ; the baseof the mould is represented in thelower edge of the batten, which isusually just its own width below thebase-line of the body-plan; in otherwords, the batten bounding or showingthe lower side of the mould, has itsupper edge to the base-line ; the out-ward side of the mould has a battenplaced with its upper edge to the diago-nal, showing the floor heads ; this bat-ten may extend no higher than is re-quired for the reception of the sharpestfloor, or it may extend to the middle-line and form the triangle ; the twoparts are united by hinges, and may beclosed when not in use ; the severaldiagonal lines and the side lines arealso represented by battens, acrosswhich the rising of the seats for thedead-wood are marked. When themould is open

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