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68 the generating sets supply current for the electric heating system, venti- lating fans, and numerous small mo- tors driving dish-washing machines, FIG. 3--24-IN. SEARCHLIGHT INSTALLED ON STEAMSHIP MOMUS. ice cream freezers, etc. The. electric heaters, of which there are 157 in 'number, were designed especially for this installation by the General Elec- pic COM wbhemise or electitc heaters was a rather bold and unprecedented departure from the regular practice of steam heating, but up to the present time the operation has been entirely satisfactory. The fact that the electrical equip- ment of the Momus is duplicated on two other ships owned by the same company, is worthy of mention and further indicates the extent to which this type of equipment is becoming utilized for light and power purposes on board ship. CHAMPION RIVET CO. An unusually attractive booklet in the interest of its product has been gotter out by the Champion Rivet Co., Cleve- land, the maker of Victor steel rivets. Primarily the booklet contains an exten- sive, illustrated report on tests made with Victor rivets. Besides are given the specifications of the American Boiler Manufacturers' Association for boiler rivets, the specifications of the Associa- tion American Steel Manufacturers for boiler rivet steel, as well as the require- ments of Lloyds, the United States navy and the British admiralty. Three prize papers on "How to Heat and Drive Good Steel Rivets," the prizes for which were tendered by the Champion Rivet Co. and awarded at the regular annual meeting of the International Boil- er Makers' Association, held in Cleve- land, May, 1907, are reproduced. In the remaining pages are given half- tone reproductions of some of the nota- ble structures and boilers on which Vic- tor steel rivets have been used. Includ- THE MaRINE. REVIEW ed are the United States armored cruis- er Washington, the United States cruis- er Des Moines, the Imperial Russian cruiser Variag, the steamship Minnesota of the Great Northern Steamship Co., the schooner Thos. W. Lawson, etc. The plant of the Champion Rivet Co., covering 414 acres, is one of the largest' in the world devoted exclusively to the manufacture of rivets. They are made in all sizes from 1% inch up, in any' length. DEAN BOILER TUBE CLEANER. A device that has come into much use and favor in. dealing with the scale problem is the Dean © boiler tube cleaner, manufactured by the cof satisfied, users to back up its guar- antees. In the accompanying cuts are shown the Dean cleaner working in a water tube boiler and also in a return tu- bular boiler. The sectional view ex- plains the workings of the device. The nozzle A, attached to a hose or gas pipe of suitable length, car- ries compressed air or dry steam into the valve chamber B, and thence goes alternately through the ports DD into the piston chamber E. At a pressure of from 40 to 80 pounds, the piston F moves the hammer handle G to and fro, imparting a vibrating motion to the hammer J. The handle of the hammer, being pivoted at H, works BOILER, DEAN BOILER TUBE CLEANER WORKING IN TUBE OF RETURN TUBULAR BOILER. Wm. B. Pierce Co., 325 Washington Steet, sbittaloe iN. oY. "Unlike. most articles of the kind on the market, it is an engine in itself, operating a miniature hammer, the motive power of which is either steam or com- pressed air, The company makes a liberal offer of furnishing one of these cleaners free 'to anyone who would make a test of it. It has numerous references the valve C so as to cover the ports in alternation. The whole tool inserted in the boiler tube, the hammer vibrates from 3,000 to 5,500 times a minute, strik- ing the tubes with very light but very frequent blows, thus jarring the scale loose and in the water tubes the rush of air, or steam, drives the loosened particles forward and out. It is claimed that from 10 to 30 SECTIONAL VIEW OF A DEAN BOILER TUBE CLEANE R,