. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . OTIVE ENGINEERING 195 equivalent, 1,225 sq. ft.; total, 4,151 ; gate area, sq. ft.; firebox, length,10 ft. 6 ins.; firebox, width, 9 ft; kind offuel, anthracite coal; tender, coal capac-ity, tons; tender, water capacity,8,000 gals. Ratios.—Weight on drivers -r- tractiveeffort, ; weight on drivers -r totalweight, per cent, ; evap. heat, surface-^superheater heat, surface, ; fireboxheat, surface -=- total heat, surface, percent, ; firebox heat, surface -r- grate
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . OTIVE ENGINEERING 195 equivalent, 1,225 sq. ft.; total, 4,151 ; gate area, sq. ft.; firebox, length,10 ft. 6 ins.; firebox, width, 9 ft; kind offuel, anthracite coal; tender, coal capac-ity, tons; tender, water capacity,8,000 gals. Ratios.—Weight on drivers -r- tractiveeffort, ; weight on drivers -r totalweight, per cent, ; evap. heat, surface-^superheater heat, surface, ; fireboxheat, surface -=- total heat, surface, percent, ; firebox heat, surface -r- grate Water and Its Usual Ingredients. Carbonic acid, air and dissolved oxygen,are the agents which accelerate corrosion,and they are present in all waters, invarying quantities. Other impurities com-mon to waters are Carbonates of Limeand Magnesia, Sulphates of Lime, Soda,Potash, and Magnesia, and the Chloridesof Soda (common salt), Potash, andMagnesia, which are the most active cor-rosive agents. Corrosion in the interiorof steam boilers exhibits itself generally Tko One Rig hi and l_3-One Left. «.m«.«..MkV.«.^ ^- THE ECONOMY SMOKE BOX USED ON THE P. & R RAILROAD. area, ; total heat, surface -f- gratearea, ; tractive effort x diameterdrivers-~ heat, surface, 716; total weight-J-total heat, surface, 66; volume of cyl-inders, cu. ft., ; total heat, surface-f-cylinder volume, 261; grate area -J- cylin-der volume, The front end whichwe have described is thoroughly satisfac-tory to the P. & K. in two forms, namely pitting and solid substances contained insome waters in service, may either hydro-lize or as we would say decompose, andthis decomposition results either in anacid (corrosive) condition, or the libera-tion of an acid in a free or uncombinedstate, but in either case it results in veryrapid and serious corrosion of the metal- lic surfaces with which the water is incontact. The substances usually found inboiler feed waters which m
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