Measurements have been carried through about the angular distribution of sound traveling in a reverberation chamber in which a certain amount of absorbing material is installed. It was measured during the decay phase of sound. Two methods were used, the first one with a directional sound source and a nondirectional microphone, the second one using a nondirectional source and a directional microphone developed in the PTB. In the latter case, the differences of angular distribution of sound, impinging on the absorbing sample, could be shown for two different states of diffuseness accomplished in the reververation chamber by installing different numbers of diffusing elements in the room. The angular distributions were investigated at frequencies of 1.2, and 4 kc.