16,353. Soo. Anon. des Etablissements Delaunay-Belleville. April 12, [Convention date]. [Addition to 25,793/11.] Water-tube boilers.-In a Belleville element consisting of two intertwining coils, a support E having the height of a box is interposed between the lowest front box B' of one coil and the second front box of the other coil. The boxes are arranged horizontally. The coils communicate with the feed - collector through separate connexions, and with the drum through a single partitioned connector.