Oh and the Wikipedia article was mainly rewritten by one contributor in 2009/2010 when the term hot worked was first included in it. I know the name of the contributor but it's not one I recognise, but it's someone who clearly knows a fair bit about glass IMHO.
I know Frank has worries about Wikipedia, as in the early days anything could be written by anyone and it stood as gospel, but over the last few years huge efforts have been made to back up the statements made with good solid evidence and references, and a lot of articles are now written by (or checked by) specialists rather than enthusiasts, so we can start to have more faith in them. The powers that run Wikipedia are getting very strict in who writes and how they do it, and if you can't back up what you say it gets reviewed and/or deleted, or has a warning added for the reader.