. Railway mechanical engineer . rivets, and was inclined at an angle of 45 deg. tothe direction in which the stress was applied. In the tests,the square joint gave an efficiency of 48 per cent., whilethe diagonal joint gave an effective efficiency of 64 percent. In other words, the tests showed that the diagonaljoint was stronger than the square one in the proportionof 64 to 48; that is, it was times as strong. Table IIindicates as the theoretical ratio in this case. This isas good an agreement as could be expected; l>ut more exten-sive data would be very acceptable. Figs. 4, 5, 6
. Railway mechanical engineer . rivets, and was inclined at an angle of 45 deg. tothe direction in which the stress was applied. In the tests,the square joint gave an efficiency of 48 per cent., whilethe diagonal joint gave an effective efficiency of 64 percent. In other words, the tests showed that the diagonaljoint was stronger than the square one in the proportionof 64 to 48; that is, it was times as strong. Table IIindicates as the theoretical ratio in this case. This isas good an agreement as could be expected; l>ut more exten-sive data would be very acceptable. Figs. 4, 5, 6 and 7 show patches designed in accordancewith the foregoing, in wliich Figs. 4, 5 and 6 show patchescovering pitted portions, while Fig. 7 shows a patch appliedon account of cracks around a washout plug hole. Fig. 8shows a liner applied around the first course of a crownbar boiler, on account of pitting completely around the tube Nofe: Weld Crack or Defecf- fo Prevent Leakage. Pafch Scarfe<d ur7derShells. Wrapper Sheet. J^. Throat Sheef^^ Patch same thickness asThroat Sheet yyrappenSheet Noie: Run pakh up to throat seam asshotvn Jt distance from crack /snot foo great. Otherwise pfacepatch seam betoir but duplicatethroat seam. -JI. These SeamsAlike ^ O OO O O O / o ( °^ I O I O I O I \ol41r O I ! ooo oo °ooo V °0°0°0 °o °0 °o°o °o ?^ Fig. 9—Throat Sheet Patch sheet, in which the liner seams duplicate the first cylindercourse circumferential seams. Fig. 9 gives instructions forapplying throat sheet seams. In the application of patches, it will be well to clean outall pits and cracks and fill them by welding, therebv check-ing the defects from spreading. The patches should beapplied on the inside if possible. For the patch, small cracks that develop while the engineis in service, a patch similar to that shown in Fig. 7 canbe designed to be applied with patch bolts, which can laterbe replaced with rivets when the tubes are renewed. To save duplication of reports, it
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
