Sound Waves and their Sources (1933) – Field Mic 07/11/2012By wtrhs Index & Index via Field Mic. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Post navigation Record grooves under an electron microscopeIran do Espírito Santo | Exhibition | Ingleby Gallery Leave a Comment Cancel replyYou must be logged in to post a comment.