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20 THE MaRINE REVIEW " eh STORY + 4 ' fob et [de pd tao *E4 +414 Soe ym te ae ae ae ELT 3ee4 Ld g 4b] I ifs Se Feat pees ee ts 7 aes =f eee LP += --+---- Ys * eee ee a ee ee ; wee fy Le et + wad. eee tt br pe ; fave} t t re ; Ne ee tt ae ee ae ASSG To wer PTT sy oie eh ee Oe et ol ---- Taste hE Ser ich tae eG ianatety c is] zles used be not only fixed to the boat, but also mechanically operated. This is done either by affixing them to towers, tops of deck-house, or _plat- forms, as shown in the various draw- ings. Hose connections are made either with the bulb turrets illustrated herein, or quick-opening valves on the sides of the deck houses. 'Inasmuch as the interest in a fire- 'boat centers in her pumps, and as the turbine centrifugal pump and out- fit represents the latest practice in this line, the 'writer gives the result of a test made on the first of the two 9,000-gallon boats designed by Mr. W. I. Babcock, for the city of Chi- cago and just delivered to them. Inasmuch as these were the first centrifugal pump boats to be used on the great lakes, the results of their tests were watched with much. in- terest: 3 eee peer? -. The general dimensions of these "boats, the Joseph Medill and 'the Greme_ Stewart, are: fire the pump impellers run dry. PLATE 1.--MAP OF MILWAUKEE, ' Length over all, 120 ft. Length of keel, 109 ft. 6 in. Beam, 28 ft. O in. Depth, 15 ft. .0 in: Displacement, 500 tons. Draught, 9 ft. 6 in. mean. In the plans as illustrated in Plate 5 it will be noted that. a unique pro- pulsive scheme was used. The main pumping and power machinery con- sisted of two 660-H. P. Curtis turbines direct connected to 200 K. W. direct- current generators and two stage cen- trifugal pumps. The: generators served to provide current for the propelling motors which are of. the variable speed-reversing type. In going to a Con- trol of these motors is possible by rheostats in both the pilot. house and engine room, and in the test the cap- tain easily handled his boat without the aid'of the engineer,. . There are two pumping-generating sets in each boat, and twin screws. Steam was: supplied by two-furnace of po | ee aot oo & OO See se eae r --¢--+--4---4+-----4 we Scotch boilers, 11 ft. 6 in. long by 12 tt 6 in. diameter; 1,910 sq. ft. heating surface in each boiler and 42 sq. ft. of grate surface. Forced draft is provided on the closed stoke-hole sys- tem. In Chicago river where these boats are to be used most of the old center pier bridges have been removed and it is necessary at times for a fire-boat to maintain itself in the middle of the river. On this account mooring spuds were adopted, operated by steam, rais- ing and lowering gear. As shown in the drawings the prin- cipal water outlets consist of two mon- itor nozzles placed on a platform dir- ectly above turrets on which are the hose connections. The pumps, though usually run _ singly, be com: pounded, and a nozzle pressure of over 300. pounds was thus obtained on the test with a resultant capacity of about 5,000 gallons per minute. In connection with this results of an_ eight-hour can boat, the endurance