| http://www.w3.org/ns/prov#value | - Preferred forms of the invention are shown in the drawings, in which h Fig. 1 is a sectional side elevation of a preferred nozzle construction; Fig. 2 is a perspective view of an annular partition and associated vanes shown in Fig. 1; and Figs. 3 to` 8 inclusive are sectional side elevations showing modiiied constructions.
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