Because of the nature of the recording medium, playback of many cylinders can cause degradation of the recording. The replay of cylinders diminishes their fidelity and degrades their recorded signals. Additionally, when exposed to humidity, mold can penetrate a cylinder's surface and cause the recording to have surface noise. Currently, the only professional machine manufactured for the playback of cylinder recordings is the Archéophone player, designed by Henri Chamoux. The Archéophone is used by the Edison National Historic Site, Bowling Green State University (Bowling Green, Ohio), The Department of Special Collections, Donald C Davidson Library at The University of California, Santa Barbara, and many other libraries and archives.