Glass in 19th century

November 12, 2018 
How "easy" to make the glass without modern chemical inductry and gas supply? How it was possible to produce a stained glass in 12th century and other questions.
some additional info:
• https://www.constructingtheuniverse.com/Chartres%20Window.html
• https://humus.livejournal.com/5408978.html
• https://humus.livejournal.com/5398537.html
• Всероссийская выставка в Нижнем Новгороде (1896) https://www.youtube.com/watch?v=Ko5mKzTGCO8
• Gothic Windows https://www.youtube.com/watch?v=HgSGWoVusfc
• https://www.google.com/search?q=rose+window&rlz=1C1EJFA_enRU781RU781&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiwyLjgys7eAhWKs48KHc_5CkAQ_AUIDigB&biw=1536&bih=706
• https://www.researchgate.net/publication/241417127_Computer-aided_modeling_applied_to_architectural_know-how_The_gothic_rose_window

Telegram channels: https://t.me/anti_swarm
https://t.me/Celno3or
https://t.me/videoCelnozor

Global Vision on rumble in russian - https://rumble.com/user/Celnozor