Sebastian Köln wrote: A small hole in the top works to "see" inside (but leaks exhaust gas).
Bill Haynes wrote:Pyrex flows 1510 degrees Fahrenheit......
thomas rubino wrote: Camera view would be convoluted (fish eye) I would think.
Phil Stevens wrote:What about borosilicate glass as used for wood-burning stoves?
Phil Stevens wrote: Blackwoods they showed me a couple that they ordered in for someone years ago who never picked them up, and told me no reasonable offer would be refused.
Phil Stevens wrote:There were two, and if my memory serves they were 15 cm diameter. I could ask if they'd let them go for $100 for the pair. Could even ship one to you, but getting it across the Pacific won't be cheap.
Phil Stevens wrote:I will prowl the secondhand dealers and see if I can find a small window from an old wood fire. All the modern ones are big and I can't imagine trying to take a wet saw to one. Anybody done this?