A convenient method for measuring moessbauer absorption line spectra has been developed.The gamma-ray source fixed on a loud speaker moves sinusoidally relative to the absorber sample and the overall counting rates of the transmission γ-rays through the absorber is measured for different amplitude of the oscillation of the gamma ray source. The resultant spectrum will correspond to the hyperfine structure of measured r-rays.We have tested the case for Co^57 r-rays with stainless steel and natural iron absorbers.