IRON SHIPBUILDING . 879 understood , however , that with the latter method the section through a line of butts will be strenger , and on that account alone should always be preferred . When double rivetting is adopted the holes for the rivets are either arranged zigzag or the chain method is em -… … Fig . 637 . — Intermediate Break - bond System of Plating . A a , Outside plating . bb , Inside plating . cc , Frames . one half times the diameter of the rivet ; while some builders adopt six diameters as the breadth of the lap , the rivet holes being one and one sixth diameters from edge of plate…
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