Cleaning slag from the freshly welded corner piece. These visible welds are the convenient ones: the back sides of the joints need welding as well, but the angle frame must be freed from the confines of the tank plates, which means taking out a lot of bolts............and putting them in again after the welding! Though this angle frame is on the bottom, the top of the tank will bolt to it when the tank is inverted to its correct position, after riveting of the bottom regions of the tank has been completed.

Photo by Bill Liebman