. The Locomotive . ction, it is importantthat we should not cut awaythe metal of the shell in thatdirection any more than wehave to, in making the man-hole opening.* In otherwords, the length of theman-hole ought not to liein the direction of thelength of the boiler, butought to run girthwise. Aman-hole placed in this wayalso has the minor advan-tage of being easier to getinto. Fig. 1 shows a badlyarranged man-hole length -was lengthwiseof the boiler, as shown ;and the result was, that theshell was cut away along the line of its greatest weakness, 4 more than it would havebeen if t
. The Locomotive . ction, it is importantthat we should not cut awaythe metal of the shell in thatdirection any more than wehave to, in making the man-hole opening.* In otherwords, the length of theman-hole ought not to liein the direction of thelength of the boiler, butought to run girthwise. Aman-hole placed in this wayalso has the minor advan-tage of being easier to getinto. Fig. 1 shows a badlyarranged man-hole length -was lengthwiseof the boiler, as shown ;and the result was, that theshell was cut away along the line of its greatest weakness, 4 more than it would havebeen if the hole had been turned the other way. The engraving serves to illustrate sev-eral other errors in design that should be avoided. The man-hole, as will be seen, wasplaced close to one of the girth joints. This is bad practice. The man-hole shouldcome in the middle of the sheet. Another point to be noted is that an 8^ opening wascut throur-h this same sheet, for the steam-nozzle. It is a serious mistake to place the. Fig. 2.— The Initial Rupture through the :Man-iiole. * The relative strengths of a boiler shell, len-thwise and sjirthwise, were discussed in The Locomotive forNovember, 1891. See also the issue for February, 1892. 1896.] THE LOCOMOTIVE. 115
Size: 1319px × 1894px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
