Melted Lead Lamp Shades?

Howdy - New to the group. Been into stained glass for about 10 years. Mostly windows, some lampshades and candle holders, etc. Arts and crafts and prairie style mostly. Anyway - I was wondering if anyone knew how the commercial stained/leaded glass lampshade makers make their shades. I mean, it sure isn't came that they are using. It often looks as though they laid the glass out on a pattern with gaps between the pieces and then poured melted lead in the gaps. Does anyone know anything about this?
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I've seen and repaired some of these. I am totally in the dark as to how/why they made them like this. I think Java had a link to a site about it?
JK Sinrod
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