This mi& is based on wave experiments performed in the toroidal plasma device B l a m " , and a comparison between experimental and theoretical values for the dispersion relation. A motorized probe, which could be moved in two axial directions, gave us the opportunity to investigate spatial dependencies, in our case wavefronts of ion-Bernstein waves.The article demonstliltes how wave measurements of this kind can be used for obtaining ion temperature and density relations between the ion species H+, H: and H : in a weakly ionized hydrogen gas. The resulting relations are compared with what was obtained in a similar experimental set-up in the plasma device Thorello in Italy.