improvements in mixed double tubing for boilers, piping, and manufacturing of the respective boilers

摘要

it is a double tube furnace mixed linear segments in which the two troncons driving juxtaposes lateralement.each stump (a, b) is a manitoba marks, rating the more away from the stump by a blade (1) with two longitudinal sides (2,3,8.(9) and are welded on the recourbes longitudinal edges of a partition body (4) and the intermediate wall into this boss (5) whose vertices are in contact (6)with the blades and are solidarises therewith