Steph Posted March 3, 2010 Report Share Posted March 3, 2010 Here's a passage from an article written about the operations at Ravenswood in about 1944. Published in 1945 in the Science and Mechanics magazine, but written when Charles Turnbull was still alive. (He died in 1944.) Sure seems to be a "we were there" account with specific info about the production of big marbles, 3/4" and up. Any reason to doubt it? The marble glass is tapped from the furnace or tank over the marble machine through an adjustable orifice, which controls the diameter of the finished product. The stream of glass is cut by part of the marble machine called a shear which shuttles from one side to the other of the glass flowing through the orifice so that the piece cut off drops to one side or the other onto the parallel, spirally-grooved rollers of the marble machine. Seven sizes are made: 1/2", 9.16", 5/8" 11/16" 3/4", 1" and 1 1/4". Two orifices are used; a 3/4" for marbles up to 11/16" in diameter, and a 1 and 1/4 inch orifice for all larger sizes. I have a copy of the article, but you can read it at this page: Ravenswood Glass Novelty Works. It discusses the way Ravenswood made glass from batch and a little bit about the chemistry. Also mentions how the war was making it challenging to find the materials needed to make the glass. Pretty cool article actually. So anyway, seems pretty technical and detailed. And it discusses big 'ol Ravenswoods specifically. So where are they? Link to comment Share on other sites More sharing options...
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