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rying steam on board the ship that is not magnesia covered and can- vas lagged. Every piston rod and valve stem of the main engine and all auxiliaries have Martell metallic packing. During the trial trip not a single steam leak developed. There is no question but that such careful conservation of heat will reduce fuel consumption and thus the cost of operation. Paying attention to such important details means ultimate op- erating efficiency. The single propeller is of sectional type cast iron and has four blades. The diameter is 14 feet 10 inches and the pitch is 14 feet 4 inches. As stated above steam is furnished by two marine Scotch boilers. Each boiler is 15 feet 4% inches in diam- eter and 11 feet 6 inches long in- side of heads. There are three 46- inch inside diameter Morrison sus- pension furnaces in each boiler. In specifications the boilers comply to Lloyd’s and the United States steam- boat inspection rules for 180 pounds per square inch working steam pres- sure. Boiler tubes are of charcoal iron and are 2% inches in diameter. These boilers were designed and built by the American Ship Building Co. at the Lorain, O., plant. They repre- sent in every detail the best modern practice for their type. Oil fuel is used. Pumping System and Auxiliaries The pumping system of this vessel though powerful and efficient is com. There paratively simple. are two BoT TOM H.P. cveR. MEP 82.5 30* SCALE CuT-oFF 1 Yo BOTTOM 30* SCALE CUT-OFF 12 %/o 20* scare cuT-oFF 634%, steam driven duplex cargo pumps 15 x 11 x 18 inches located in the forward pump room. These two pumps were furnished by the Na- tional Transit Co. There is also one DIA. PISTON RODS DIA. H.P. CYLINDER DIA. IP. CYLINGER DIA. LP. CYLINDER STROKE BOILER PRESSURE H.P. RECEIVER PRESSURE \.P. RECEIVER PRESSURE L.P. RECEIVER PRESSURE VACUUM 24.75" R.P.M. 95.5 HORSE POWER H.P.ENGINE 689.790 HORSE POWER |.P. ENGINE 859.59] HORSE POWER LP. ENGINE IZ11- 120 TOTAL HORSE POWER. 2754-511 i75* 168” 65 \5.5* PISTON ROD AREAS HAVE BEEN QEDUCTED IN COMPUTING HORSE POWERS. TEAL Le VL: 5S: 5. FOBERT W. STEWARD IND/CATOR CAPD FOR ie MAX/MUM HORSEPOWER QOOT EEF SEL NOS CAROS TAKEN on LAKE ERIE aprir 4T 1923. 7 x 6 x 10 inches duplex transfer pump located in the forward pump room and a 6 x 4 x 6 inches duplex bilge pump in the same location. For ventilating the forward pump + -Eié f y | oB06-6-6.0-00-0-0-0- 6 0-0-0 $0 cro b” ©-@-© © 0 0-0 0-00-08 00-00 oO » DPOOPOVDOOOHO b Sicutere “O q ~@ wee $ 7} 4 OOS pee STEEL—Stays —2 Lt ~Bopy —3gsceew——— srelmes! ith oe DODGE Db HY | < by wy ADA Eaetesk iat e6 yap 4 ya +4 @ © + O* : [| A \\ x. d WOOGOO on kz a t C006 4: ote Firti —474—-Toses In ALL 2 fe Seeweo-THRG Gorn Tose Sneers. Markeo (4 “{3}—- 43 Stay —* 7 BWG—THicxenEo ATGBorTn Enos Ano OS try —* GWG Taree NED AT Born Enos Arto—f] —Seeeweo THOS GOT TAO l GaP ET << Dian —Sest —Lap. Wervep 12 TrtRencs—Pee-INGH—— . -— Tae | sa ISAS CREAN CARS Layout of Scotch Type Boiler—Two of These Fitted in the Robert W. Stewart MARINE REVIEW—May, 1928