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MARINE REVIEW. 9 diculars, 48 feet beam and 28 feet deep. Her water bottom is 5 feet 6 inches deep, is divided into ten compartments and has a capacity for 2,100 tons of water. The boilers, built by Wickes Bros., Saginaw, Mich., are situated well aft upon the main deck, and are two in number, placed side by side, with axes parallel to the keel. They are 15 feet diameter and 12 feet long, and built to carry 170 pounds of steam. Fach boiler contains three 1 inch furnaces with 5 feet 6 inches grates and 477 24-inch tubes. The aggregate heating surface of the two boilers is 6,230 square feet, and the aggregate grate surface is 120 square feet, making the ratio 51.92. The peculiar feature in this steam plant is to be found in the Ellis & Eaves system of induced draft. In this system the products of combustion are drawn from the boilers by fans. The air for supplying combustion passes through tubes, over the outside of which the hot products of combustion are being drawn, and by this means the air is highly heated before entering the fur- naces under the grates, and at the same time the strength of the draft is indep mdent of the heat of escaping gases and of the wind and weather. : In this particular case the fans are placed one at the back end of each boiler and against the bulkhead between the engine and the boiler rooms. The discharge of the smoke through the funnel is prevented by dampers and is taken over the top of the boilers in large sheet iron boxes, down through the fans, and from thence into the funnel above the dampers. These sheet iron boxes are full of tubes running lengthwise of the same and open at the back end, and it is here that the air for supplying combustion is taken into the system. The air passes through these tubes, is heated in trangjt and finds its way into the furnaces under the grates through ducts around the breeching. The ash-pit doors hinge upward and contain dampers which were open during all the tests except Nos. 8 and 5. Valves are also provided to admit air above the grates, but these were fastened shut all the time. The fans were of B. F. Sturtevant manufacture. The main engines are triple expansion, 23, 374 and 63 inches diameter by 44 inches stroke. Piston valves are on H. P. and I. P. I SECTION AT A-B SECTION AT C-D 9000000004 0300000000 9000 oo 09000000500 Oo000000005 O000000000 00009099009 $ 9000000000 009 00099050 9000000000 iciee) 0-0 \o=a) WZ iE --A/"I cylinders. A double-ported valve is on the L. P. cylinder. All pumps are independent and of the following dimensions: AirspumpiRinglessids aseedel) DO aa 14, 24 by 24 inches. Dwoiballast pumps,'duplex.is.<i 2. anise... 8, 14 «by 16 One deck pump, (Shee art Ae 6,4 by é in One bilge pump, ih ak) eS, cin hue 6,44 by 6 f One feed pump, bids cdearsi ly ae et a, LOZ bby 10 i One cooler pump, iGo nieces. Suis a 4,3 .by 4 ee All pumps were made by Dean Bros. of 'Indianapolis, Ind. The other auxiliaries consisted of a General Electric Company's en- gine, 4 by 10 inches, double, making 650 revolutions per minute, and one Williamson steering engine. On account of the ease with which the vessel steered the latter took very little steam. The exhaust from all the auxiliaries passed through the tubes of a feed water heater and raised the temperature of the feed water about 60. degrees. The working platform of the main engine was on the main deck with. all pumps below, but controlable from working Platform. Steam was taken from a perforated dry pipe in the boiler. Heed water entered the boiler through internal pipes delivering below the furnaces, A Union feed water meter, which had been recently calibrated and found to be correct within 1 per cent., was put ona byepass in the feed water pipe between the heater and the boiler. All the coal used during tests was carefully weighed, and the time of starting and stopping each test was so arranged that the fires were all cleaned once 2900000000}/|/0O00000000g 000 Sao Osos during the test and were in the same condition at the end as at the beginning. In test No. 3 these precautions were observed, but on account of the short duration of the test it did not permit the burning down of the extra amount of coal used in cleaning the fires, and the fires were not in the normal condition at the end of ie test. are the means of observations The pressures, temperatures, etc.., made every hour during each test and the horse power is the mean figured from cards taken 'hourly. Test No. 1 was made on Lake Huron going up with the vessel drawing 13 feet 8 inches aft and 6 feet for- ward, compartments aft full and those forward 3 feet deep. During the latter 'half of the test: the electric engine was running. Head wind and sea were encountered. up Lake Superior to Devil island. From this point to Duluth, a distance of 68 miles, the. speed was 16.3 miles per hour, revolutions 94:5 per minute, and indicated horse power, with all valves in full: gear, 2,288.5. Fires were cleaned during this run without reduction of steam pressure. ' Considerable water still remained in ballast-tanks on reaching Duluth. The vessel loaded 132,500 bushels of wheat at Duluth, equivalent to 3,975 net tons, and draft forward and aft was 14 feet 5 inches and 14 feat 9 inches Peels Test No. 2:was made on Lake euperce coming | down. ariee tee engine was running. _. Test No, 3 :was made, on Lake Huron, coming down, during day- lig ht.. Dampers in ash pit were closed. 'Test No. 4 was made on Lake. Huron. in davai Danie were.