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March, 1912 THE MARINE REVIEW 105 is divided by a diaphragm into two parts, one of them forming a passage from the drum to the large down-flow tubes, the other receiving the ends of the generating tubes, thus completing the circulation and delivering above the water line in the drum. The water legs, or ditches, are con- structed of steel plates, 32) if, in thickness, forming the tube and hand- hole sheets. These sheets are spaced about 3%4 in. apart, stayed to each other by improved and patented con- tinuous stays, dividing the water leg into a number of rectangular pas- sages, as shown in Figs. 3 and 4. T-shaped retaining grooves. are milled in the tube and _ hand-hole plates approximately 6 inches from center te center. In these retaining grooves are fitted, in sections, a con- tinuous I-shaped stay plate connecting -- the two sheets, thus forming the rectangular passages shown in Figs. 3 and 4. This construction is much stronger than any other method of supporting flat surfaces, as the connection is prac- tically a continuous line, and the load per inch of stay is equal to the dis- tance from center to center of the stays, multiplied by the working pres- Fic. 1--ApAPTED For VESSELS or Limiten HeicHt BETwreEN DeEcKS sure, or only 1,800 Ib. per lineal inch for 300 lb. of steam---compared with | 10,800 Ib. per stay for the usual method of staybolting on 6-in. centers. Expansion and con- traction is provided for by the flexibility of the stay plates, and the movement of the stay in the retaining grooves. The trou- A New Marine Water-Tube Boiler The water tube marine boiler, shown hy the accompanying photographs, is an entire departure from the gener- ally accepted type, as the numerous headers and expanded nipple connec- tions are eliminated. There are ab- solutely no joints or connections ex- cept the ends of the generating tubes, which are expanded into the water legs or flitches. These boilers are built in two types and of varying sizes to meet require- ments. Fig. 1 is particularly adapted for vessels of limited height between decks and mecderate forced draft. The steam and water drum is located over the front flitch and at the low end of the tubes. Circulation is provided for. by large openings in the bottom of the drum, registering with the rectangular passages in the water legs, delivering to the generating tubes an ample sup- ply of water. The return from the upper flitch to the drum is through the top row of 4-inch tubes. Fig.. 2 has much larger passages for the circulation, and is designed for forced or natural draft and the greatest econon.y, having super-heater and feed water heater. As seen from the pho- tograph, the drum is in the front or the high side, the upper pertion of! the front flitch is enlarged where it is riveted to the drum; this chamber Fic. 2--DesicNep For Forcrp or Naturat Drart