Parabolic Arch takes shape

Where two of the roundels meet at first floor level, the ceiling joint forms a parabolic arch. This is a structural steel element of the build and has had the fabricators really scratching their heads as every attempt to form the lintel from a single piece has failed. In the end they have created the basic shape by welding pieces together and thus passed the problem of smoothing out the curve to the chippies and the plasterers!