just something i found interesting...
http://www.kk.org/streetuse/archives/2006/08/jazz_on_bones_xray_sound_recor_1.php
"During the late 1930s and early 1940s the prevalent sound recording apparatus was the wax disk cutter. As a consequence of the lack of materials in the war-time economy, some inventive sound hunters made their own experiments with new materials within their reach..."
http://www.kk.org/streetuse/archives/2006/08/jazz_on_bones_xray_sound_recor_1.php
"During the late 1930s and early 1940s the prevalent sound recording apparatus was the wax disk cutter. As a consequence of the lack of materials in the war-time economy, some inventive sound hunters made their own experiments with new materials within their reach..."
