2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22296We report theoretical calculations of the spectrum of third sound modes for a cylindrically symmetric film of superfluid $^3$He, and compare these results with experimental data for the mode frequencies and amplitude spectrum of surface waves of superfluid $^3$He films.8 pages, 5 figures, LaTeX, submitted to JLTPSuperconductivitytext