. Official proceedings . bituminous coal engines, the line shouldbe chosen, and. for an example, let us see what this linewill give. 198 Proceeclines Rail\\a\- Club of Pittsbiirpli. In the tirst place it shows that with coal at 6oc per ton onthe tender, there is an even break, that is, the cost of maintainingbrick arches just equals the money saving in coal. Assuming coal at $ on the tender, the net saving isSi per thousand engine miles. This is on a basis of brick arch maintenance cost being^^•33i P^^ tlnxisand engine miles, as taken from the Uoiler Alakersreport, and und
. Official proceedings . bituminous coal engines, the line shouldbe chosen, and. for an example, let us see what this linewill give. 198 Proceeclines Rail\\a\- Club of Pittsbiirpli. In the tirst place it shows that with coal at 6oc per ton onthe tender, there is an even break, that is, the cost of maintainingbrick arches just equals the money saving in coal. Assuming coal at $ on the tender, the net saving isSi per thousand engine miles. This is on a basis of brick arch maintenance cost being^^•33i P^^ tlnxisand engine miles, as taken from the Uoiler Alakersreport, and undoubtedly comes close to the average figure thecountry over. However, a great many roads that have recentlytaken up the arch, are obtaining a much lower figure for main-tenance than that shown. Otir work for the past few years hasbeen to develop and improve the brick arch, to the end that archesmay be so designed and constructed as to give the maximiniiresults in the way of benefits with the minimum of Figure 8. The photograph shown here as Figure 8 is of the interiorof a locomotive firebox showing an arch after two weeks serv-ice. It represents what we consider the best arrangement todate. The brick units are all of an ideal size for handling; thev Discussion—The Relation of the Brick Arch. 199 can he removed and replaced when necessary with a minimumloss. For stay-bolt test only a small percentage of the brick needbe disturbed. For flue attention only one-fifth of the arch needcome down. In other words, the expense and the inconvenienceattendant to the up-keep are by virtue of this design, reduced toa minimum—a practical, inexpensive brick arch for modern con-ditions of locomotive operation. AlCE-PRESIDEXT: Gentlemen, the question is now openfor discussion. I will first call on Mr. D. J. Redding. AIR. D. J. REDDIXG: Air. President and Gentlemen—Weuse brick arches in passenger service. We have not gone into thearch question to any extent in freight eng
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