Shipbuilding in iron and steel / a practical treatise . . shaft is prevented by the bearing B, it is obviousthat when the shaft is turned from the main deck thedoor must move vertically. In this case the door andframe are of cast iron, and the vertical wedge-shapedsection is given to the edges of the door in bearings are worked on both sides of the door,on the vertical and the lower edges, in order to makewatertight joints with the rabbets of the frame. In vessels where the bulkheads extend up to the maindeck it is very desirable that there should be directcommunication between t
Shipbuilding in iron and steel / a practical treatise . . shaft is prevented by the bearing B, it is obviousthat when the shaft is turned from the main deck thedoor must move vertically. In this case the door andframe are of cast iron, and the vertical wedge-shapedsection is given to the edges of the door in bearings are worked on both sides of the door,on the vertical and the lower edges, in order to makewatertight joints with the rabbets of the frame. In vessels where the bulkheads extend up to the maindeck it is very desirable that there should be directcommunication between the various parts of the lowerdeck. For this purpose light watertight doors are fittedin the ships of the Eoyal Navy, similar to that shownby the horizontal section in Fig. 175, which is takenfrom the Bellerophon. The door is formed of a wrought-iron plate stiffened by strips on the edges and under the Fig. 174. Chap. XI. Bulkheads. 233 middle hinge, and when closed fits tiglitly into the rabbetsof a wrought-iron frame which is fastened on the Fig. 175. The door is hung to the frame by three hinges, similar to that ofwhich the details are given in the section. Beads of india-rubberare fitted in the rabbets of the frame, and project above thesurface of the rabbet. When the door is to be closed, the clamp-screws (or butterfly nuts), which are hinged to the frame, areturned back from the doorway, and when the door has been broughtinto the rabbet they are turned up into the forks of the lugs on theedge of the door and are hove up. By this means the door is pressedtightly against the india-rubber beading, and the rabbet is madewatertight There are no brass bearings fitted on these doors, and,as they are above the lower deck, it is obvious that there would beample time for the doors being closed and secured by manuallabour in ease of any compartment being injured. In the iron-clad frigates of the Royal Navy admission isobtained to the wing passages from the lower deck throu
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherlondo, bookyear1869
