I was so excited when I stumbled across this article. Written in 1851 after a visit there, the article is entitled Glass of Bohemia and starts on page 291
It mentions Zahn and Egermann and Charles Antoin Günther and discusses the enamelling and work on the glass, plus their houses etc.
I have no idea if the Charles Antoin Günther is who I know as Carl Günther but the discussion of his work and how fabulous it is, makes me wonder. I shall go and do some more digging.
It's absolutely fascinating!
It discusses how the houses are laid out and where the glass factories are etc. It's like going back in time. Amazing read.
Also talks about the gilding and the colours used and how the glass was made etc. just fantastic information.
It also discusses how one person was enamelling insects and when the author questioned about them, he brought out a box of perfectly preserved specimens of insects from which he was accurately painting exactly those specimens on the glass - I need to link this to my insect jug as well

I will also make a link to my cameo glass vase thread which I hope dates to a similar period to this.
A fantastic insight into Glass making during that period. Sorry about my excitement but I find this kind of reading mesmerising

I might have added this one before and forgotten about it, but I don't think so.
Source: THE INTERNATIONAL MAGAZINE Of Literature, Art, and Science.Vol. IV. NEW-YORK, OCTOBER 1, 1851. No. III.
http://www.gutenberg.org/files/36564/36564-h/36564-h.htmm