RED Matthews
Posts: 2396
Joined: 8/2/2008 Status: offline
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INTERESTING Thread; I have collected and saved a lot of different pontil marked glass. The thing that interests me the most is the material used to pick up the media that holds the bottle formed. I realize that white lead, red lead and graphite pastes were used to hold the media material, ie. iron powder, sand, glass dust and/or chips. I have deep push-up punty rod wines, with just white lead on the contact surface. It must have held the bottle with the shape as much as the media. It is also interesting to realize that the punty rods diameter has a lot to do with the weight of the bottle that has to be held. In many of these applications the glass dust and chips were only picked up on the edge of the punty rods shape. There is a big lack of mechanical information in the written descriptions, written in the books on early glass forming. It was just job security to keep what your do or did, from being blabbed out to those writing their descriptions. At least that is in my opinion. RED Matthews
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