Journal . boiler. The space between theboiler and the arch is tilled with dry sand, which is (irevented from running out at the sides by pieces ofjriek shaped to tit. The boiler 1- now free to mover these arches without producingany crevices whichcan lead to leakage and loss, and the arches themselvesare thoroughly stable structures. I have foun 1 thisplan a complete preventive of loss, as it compels thetrot gases to traverse the entire length of the at the same time to take that course which Ibelieve to be most desirable. While speaking of flues, I should like to impressupon you the
Journal . boiler. The space between theboiler and the arch is tilled with dry sand, which is (irevented from running out at the sides by pieces ofjriek shaped to tit. The boiler 1- now free to mover these arches without producingany crevices whichcan lead to leakage and loss, and the arches themselvesare thoroughly stable structures. I have foun 1 thisplan a complete preventive of loss, as it compels thetrot gases to traverse the entire length of the at the same time to take that course which Ibelieve to be most desirable. While speaking of flues, I should like to impressupon you the desirability of making the side fluesmore roomy than they are frequently constructed. Ifevery designer of a boiler setting were made to crawdup a hot side flue, he would agree with what I people think that six inches wide in the narrowestplace is sufficient, but in the interest of efficient ex-amination, and of the inspectors themselves, I woulds<iy never make this width less than nine I think I can show you. however, that the plan Iadvocate for the course of the hot gases is quite com-patible with tightness, and I shall ask you to refer todrawing No. 3. Please remember that, after thehave left the internal flues, we want them topass along the bottom flue back to the front end, thenthrough the side flues, and out to the chimney. Atthe back end of the boiler it is therefore necessary tobuild partitions to prevent the gases passing to thechimney before they have traversed the bottom andside flues. These partitions usually consist of steppedbrick midfeathers built into the back end wall, andbrought up against the back end of the boiler, as indi-cated on the drawing. Now, these midfeathersare excessively unstable things, and time after time,when examining boilers, I have found them tohave more or less given way, and the hot gases to beescaping Btraight to the chimney, without doing anywork in the bottom and side flues at all. Apart fromthe instability of these
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
