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VOL. 40. CLEVELAND, MARCH, 1910. NEW YORK No. 3 The Seattle Fireboat Duwamish OSSIBLY as much interest, from an engineering standpoint, at- taches to the design of a fireboat as to any other type of vessel produced in the modern ship yard. A successful fireboat involves a nice com- bination of the principles of naval ar- chitecture and of marine, mechanical and hydraulic engineering and represents a a ieee By H. Cote Estep. ready to leave her berth at any time and get quickly to the scene of the conflagration; when there she must be ready to deliver a large volume of water at high pressure continuously for many hours, or even days, if neces- sary. To insure success in these vital particulars great care must be be- 'stowed on the design and installation every part of which of machinery, = 'boat was needed to replace the old wooden fire tug, Snoqualmie, which is of inferior capacity. McAllaster & Ben- nett, naval architects, Seattle, were commissioned to design the new boat, and the steel, twin-screw steamer, Du- wamish, recently placed in commis- sion, is the result. In one important particular the Du- wamish is a departure from the gen- discriminating compromise between many demands, of which the chief are a seaworthy, fast, readily maneuvered hull, ample boiler capacity, and above all a reliable, powerful, high-pressure, pumping equipment. A fireboat and a naval. vessel are alike in that their machinery and me- chanical equipment are of first im- portance; on the. mechanical depart- ment the designer concentrates his best thought. A fire boat must be OUTBOARD PROFILE FIREBOAT DUWAMISH. should not only be able to perform its own functions well, but should work in harmony with the other parts. In recent years a number of new and powerful fireboats have been built to protect floating and harbor prop- erty in the cities of Chicago, New York and San Francisco, and for the Duluth, Mesaba & Northern railroad, at Duluth. Somewhat over a year ago the city of Seattle, on Puget sound, awoke to the fact that -a modern fire- eral tendency observed in recent fire- boat designs. In each of the seven boats built in the past two years for San Francisco, Duluth, Chicago and New York, two-stage centrifugal fire pumps direct-connected to steam tur- bines were installed, but in the Seattle boat reciprocating pumps were fur- nished. It will be noted that the nor- mal working pressure of the turbo- pump boats, with pumps working in parallel, that is to say delivering into. 'e fe he