Abstract: An arrangement for mounting in an opening of a building frame a window unit having at least one panel mounted in a rectangular framework formed by a pair of left and right longitudinal frames, and an upper transverse frame and a lower transverse frame means which are connected, respectively, to the longitudinal frames at upper and lower positions includes upper connecting metal fixtures fixedly secured to the upper part of said opening of the building frame, and lower connecting metal fixtures fixedly secured to the lower part of the opening of the building frame, the indoor side of the upper transverse frame of said window unit being connected to said upper connecting metal fixtures, and the indoor side of the lower transverse frame means of said window unit being connected to said lower connecting metal fixtures, so that a window unit can be mounted rigidly onto a building frame by a simple operation in such a manner as to prevent deformation or bending of a lower window frame and a transom towards the indo

Abstract: A steam reactor comprises a pressure shell having inlet and outlet nozzles for each of a process gas and a heating gas, a plurality of metal catalyst tubes packed with a catalyst and located substantially vertically within the pressure shell, one and of each of the catalyst tubes being connected to a pipe and the other end being communicated with the inlet nozzle of the process gas; and a riser pipe located substantially vertically within the pressure shell, one end of the riser pipe being connected to the pipes and the other end being terminated in the outlet nozzle of the process gas. A support member is provided on the pressure shell to support the catalyst tubes and the riser pipe. The plurality of pipes which connect the catalyst tubes and the riser pipe have a diameter which is smaller than that of the catalyst tubes and the riser pipe and a structure capable of taking up the difference in thermal expansion between the catalyst tubes and the riser pipe.