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1. A Francis turbine, or any other machine built according to the Francis principle, comprising:
a blade wheel having a plurality of blades, wherein at least one of said plurality of blades is adjustable; a spiral housing which encloses said blade wheel; a traverse ring having a plurality of traverses, wherein a portion of said traverse ring having larger traverses extends over a portion of a circumference of said blade wheel, starting at a beginning of a spiral, and a portion of said traverse ring having smaller traverses extends over a further circumference of said blade wheel up to an end of said spiral; an inner blade wheel ring which is provided downstream of said traverse ring; and an outer guide blade ring which is disposed upstream of said traverse ring.
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