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(a oA FP PB EPENIEN WEA DES 0A XIE PRET EL AL ORIIY IVE TOWER FS EB EOS WALLIS: aneees ee ee ee areas Se NE eee ees eee: : '3 IEA TT RELA BEER AE CIE ERE ERLE A EE Tg ep ATE IO Os" 2 BAP FRO DS =O" BED The Sectional Express Boiler The Babcock & Wilcox Sectional Express Boiler is a light weight, compact, and highly efficient unit designed to meet limitations of weight and space and the requirements of Modern Steam. There are no untried mechanical features of construction. The sectional headers are modifi- cations of those used in the well known Babcock & Wilcox boiler ...set to provide a decreasing area of gas passage through the boiler resulting in a uniform high rate of heat transfer with stack temperature so low as to economically eliminate the necessity of the air preheater to attain high overall efficiency. Tests of this type of boiler have shown efficiencies of 82.75% to 84.62% over a range of one pound to one quarter pound of oil per square foot of heating surface per hour. Thirty boilers of this type are under construc- tion for the new Scout Cruisers Minneapolis, New Orleans, and Astoria and for the Airplane Carrier Ranger THe BABCOCK & WILCOX 85 LIBERTY ST. COMPANY NEW YORK, N.Y. M-25 MARINE REVIEw--January, 1931