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" MARINE REVIEW AND MARINE RECORD. BURNING BRASS TIPS ON CAST IRON PROPELLERS. A method of repairing cast iron propeller wheels is in vogue at Mort's Dock & Engineering Co.'s foundry, Sidney, N. S. W., which is said to be practically unknown in Europe and America. It is the fusion of gun-metal tips to cast iron propeller blades by the "burning-on" process. On account of cost, cast iron propel- lers are used to a large extent, although they are, of course, much inferior to bronze in point of durability. The "tips," the portion 12 to 18 in. from the ends of the blades, are likely to be broken by striking floating debris, hidden rocks, wharf projections, "racing," etc., but the greatest source of damage in the case of steel and iron vessels is corrosion due to galvanic action. When a propeller blade is broken the usual method of repair is to re- place it with a new one, but it sometimes happens that a ship cannot be detained in port long enough to allow a new blade to be made, and in that case a new tip is "burned on," which can be done in a few hours. The blade to be repaired is taken to a drilling machine and drilled across with holes about % in. apart, so that the bad part may be easily broken off. It is then taken into the iron foundry, bedded in the floor, and a cope rammed up over the portion that is to be renewed. The mold is then parted, finished, dried, closed and cast with gun metal in place of the cast iron tip which has been broken off. The gun metal having been cast against the cast iron blade, it has now to be "burned" to it. 'The cope is thrown off while the casting is hot,.and an "open" burn laid right across where the brass and iron join. It is then burned with iron, care being taken that the metal from the ladle falls directly onto the iron part 'of the blade so as to cut into it without washing away too much of the brass. If attention is given to the center, or thickest part of the blade, in the process of burning, one can always make sure of a satis- factory joint. The proper way is to use a feeding rod as a guide, working it along the joint gradually as the iron dissolves. After the burn is thoroughly cooled it is trimmed off, and the blade [F eb. 19, c sent to the ship. Although a blade treated in this way presents a somewhat piebald appearance--owing to the light and shade of brass and iron--there is nothing weak about it. All sorts of mechanical tests have been made in order to separate the brass and iron, without success. The bronze tip is not, of course, affected by corrosion, so that the repaired blade is practically better than the original--Machinery. ai When the British admiralty drew up the program, for. the forthcoming long-distance trials of the cruisers, Minerva. and) Hyacinth it was arranged that at least two members of the} special boiler committee should make the passage in each ship.. It is reported that the admiralty has now decided to leave the, conduct of the trials entirely in the hands of the ships' own offi+) cers and the umpires at Portsmouth, Devonport and Gibraltar. At the home ports the commanders-in-chief will be umpires; at Gibraltar the senior naval officer present when the vessels ar- rive will undertake this duty. It is understood that Com'dr. C. W. Rae has been selected as the successor of Rear Admiral George W. Melville as chief of the bureau of steam engineering of the navy department. Com(édr. Rae is at present a member of the examining board. Rear Ad-- miral Melville retires next August. Tug for Sale. _ Tue Norris.--47 ft. long, 12 {t.. beam, draught only 4 ft.. Hull thoroughly re- built last winter. Boiler 44 in. diameter by 7 ft. high. Allowed 150 Ibs. pressure. En- gine 8x8. Boiler and engine nearly new and in first class condition. Speed 9 miles per hour. Plenty of deck room. Write for further particulars Hardy & Dischinger, Toledo, Ohio. Mar. &. If you Se | 7 to oe WHY | Dearing Water Tube Boilers are best ? ? 2? Drop us a postal Dearing Water Tube Boiler Company -- 288 to 296 Fort St., West. DETROIT, MICH. English Royal Navy - = : Russian Imperial Navy Japanese Imperial Navy . Italian Royal Navy - - - Chilian Navy © - - 4 : Argentine Navy -- - - = The " Messageries Maritimes" Company BELLEVILLE WATER-TUBE BOILERS NOW IN USE (AUGUST, 1902) On Board Sea-going Vessels, NOT INCLUDING New In- | | stallations Building or Erecting. | | 'French Navy - . oe s | Austrian Imperial Navy os Chemins de fer de l'OQuest: (The French Western Railway Co.) Steamships plying between Dieppe and Newhaven - - Total Horse Power of Boilers in Use 268,020 H. P. 745,900 " = 45490) & 110,700. '§ 32,900 " | 418,500 =| " - 26,500 . " < - - 13,000 -° = 87,0000 : 18,500 " Se 3 1504520: WORKS: Ateliers et Chantiers de l'Ermitage, at Saint-Denis (Seine), France. TELEGRAPHIC ADDRESS: Belleville, Saint-Denis-Sur-Seine.