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The combination of a substantially semi‐cylindrical turbine casing half, a substantially semicylindrical diaphragm half disposed in the casing half, and a supporting and centering arrangement connecting the halves and comprising means positioning the diaphragm half so that one of its diameters coincides with a diameter of the casing half and other means circumferentially spaced from the first named means and secured to one of the halves and projecting into and engaging walls of recesses in the other half to support the diaphragm half on the casing half, said other means being adjustable to permit positioning of the diaphragm half with respect to another diameter of the casing half and upon adjustment to cause another diameter of the diaphragm half transverse to the first‐mentioned diameter to coincide with such other diameter of the casing half.