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Is this rock used at any specific time or around the clock? Mike Shaw ----- Original Message ----- From: Pratt, Daniel R. <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, January 22, 2002 10:15 PM Subject: Re: gramophone records Everyone knows the best mineral for the manufacture of gramophone records is plain old rock. Sorry. Daniel R. Pratt Architectural Historian, Archaeologist (RPA), Office Safety Coordinator HDR Engineering, Inc., 6190 Golden Hills Drive, Minneapolis, MN 55416 (763) 591-5423 direct (763) 591-5413 fax [log in to unmask] <mailto:[log in to unmask]> -----Original Message----- From: Michael Shaw [mailto:[log in to unmask]] Sent: Tuesday, January 22, 2002 4:38 PM To: [log in to unmask] Subject: Re: gramophone records Some mineral found at Tews shaft, Bog mine, Shropshire was considered to possibly have been of use for the manufacture of gramophone records, but proved not to be. Does anyone have any idea what the substance could have been. My informant was a retired miner, he did not work at Bog which had closed for good when he was about 11. Mike Shaw