. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . laced. Sometimes a stick or ^* brick of the chemicalis placed directly in the boiler, through a hand-hole, during oneof its periodical cleanings. In spite of the inefficiency of themethod, 70% of replies to a circular inquiry reported the use ofsome kind of boiler compound. The chemicals used, some ofwhich are patented compounds, are in general the same as thoseused in the outside chemical plants. Sodium carbonate is themost common constituent. 324. Tanks. Whatever the source,
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . laced. Sometimes a stick or ^* brick of the chemicalis placed directly in the boiler, through a hand-hole, during oneof its periodical cleanings. In spite of the inefficiency of themethod, 70% of replies to a circular inquiry reported the use ofsome kind of boiler compound. The chemicals used, some ofwhich are patented compounds, are in general the same as thoseused in the outside chemical plants. Sodium carbonate is themost common constituent. 324. Tanks. Whatever the source, the water must be ledor pumped into tanks which are supported on frames so that the bottoms of the tanks areabout 12 feet above therails. Wooden tanks hav-ing a diameter of 24 feet,16 feet high, and with acapacity of over 50000gallons, are frequentlyemployed. Iron or steeltanks are also used. In Table XXVII isshown the capacity ofcylindrical water-tanks inUnited States standardgallons of 231 cubic this table the di-mensions of a tank ofany desired capacity maytanks are sometimes usedThe smaller sizes. Fig. 158.—Water-tank. readily be found. Two or morerather than construct one of excessive size,shown in the table are of course too small for ordinary use,but that part of the table was filled out for its possible con-venience otherwise. On single-track roads where all enginesuse one track the tank may be placed 8 5^ from the trackcenter; this gives sufficient clearance and yet permits the useof a single swinging pipe which will reach from the bottomof the tank to the tender manhole. In Fig, 158 is illustratedone form of wooden tank. They are preferably manufacturedby those who make a special business of it and who by the use § 325. MISCELLANEOUS STKUCTUKES AND BUILDINGS. 373 TABLE XXVII—CAPACITY OF CYLINDRICAL WATER-TANKS INUNITED STATES STANDARD GALLONS OF 231 CUBIC INCHES. Height Diameter of tank in feet. infeet. 10 12 14 16 18 20 22 24 678910 35254113470052885
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