. L'arrêt américain du génie ; un travail pratique qui commence à la chaufferie et prend dans l'ensemble de la centrale électrique. ≫3 chaudière à vapeur de la marine. Chaudières marines de plus de 9 pieds de diamètre ont en général twofurnaces, ceux de plus de 13 à 14 pieds, trois, tandis que les très largestboilers utilisés sur le courrier de première classe, et des bateaux à vapeur qui oftenexceed quinze pieds de diamètre, ont quatre fours. - Dans le milieu marin le coursetaken chaudière par les produits de l'affaire combus-tion est la suivante ; le entersthrough le fourneau de charbon sur les portes de la fire-bars, la chaleur et l'flamespass au feu pont dans theflame ou combu

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. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. >3 THE MARINE STEAM BOILER. Marine boilers over nine feet in diameter have generally twofurnaces, those over 13 to 14 feet, three, while the very largestboilers used on first-class mail steamers, and which oftenexceed fifteen feet in diameter, have four furnaces. - In the marine boiler the coursetaken by the products of combus-tion is as follows; the coal entersthrough the furnace doors on tothe fire-bars, the heat and flamespass over the fire bridge into theflame or combustion chamber, thence through the tubes intothe smoke-box, up the up-takeand funnel into the air. The fittings to a marine boilerare—funnel and air casings, up-takes and air casings, smokeboxes and doors, fire doors, bars, bridges, and bearers, main steam stop valve, donkey valve, safety valves and drain pipes, main and donkey feed checkvalves, blow-ofl and scum cocks, water gauge glasses on fronfand back of boiler, test water cock for txying density of watersteam cock for whistle, and another for winches on deck.. A fitting, called a blast pipe, is sometimes placed in thethroat of the funnel. It consists of a wrought iron pipe, hav-ing a conical nozzle within the funnel pointing upwards, tlie other end being connected to a cock^ which latter is boltedon to the steam space or dome of the boiler. It is used forincreasing the intensity of the draft, the upward current ofsteam forcing the air out of the funnel at a great velocity; andthe air having to be replaced by a fresh supply through theash-pits and bars of the furnaces, a greater speed of combus-tion is obtained than would otherwise be dne to simple draftAlono. 64 Maxims and Instructions THE MARINE STEAM BOILER.Boilers are fitted with dry and wet uptakes, which differfrom each other as follows :—The dry uptake is wholly out-side the boiler, and consists of an external casing bolted onto the firing end of the boiler, coverin

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