Thanks CMOG. It's one thing to see the pieces in the museum and be told how they're made, it's so much more fascinating to see it happen. (BTW... I'm selling my tools and buying a stick.)
I really enjoy the historical aspect of this video. I have just one question regarding "cracking off" I know this is a really old method which I have used myself. In recent times this is achieved with a torch, but this tool was not available in Roman times. Historically what instrument would they use to apply the heat needed for this technique?
They would have used a hot thread of glass wrapped around the vessel, or perhaps a hot wire - either to encircle the vessel at a predetermined point and shock the glass - inducing a crack to run around the circumference.
I have seen egiptian jewelers working with a torch in ancient bas reliefs ; any ancient jeweller had to use a torch in order to soldering gold or silver
Can you please show and tell about such a glass melting furnace at 2:35 ? How is it made and what materials is it made of? There are no such videos on the Internet !
I love watching the videos on this cmog channel! Everytime interesting and eductive. This is excellent craftmanship. Wondering how they control the annealing with these (wood) fires?
Wood fired annealers are challenging to keep steady, but the chamber is kept fed with heat and by changing the flue opening, more heat can be let in or let out. To cool the work down, the fire is left to slowly dwindle, while the chamber is sealed. The heat from the walls of the chamber radiates inward and helps temper how fast the chamber cools. Fortunately, the glass is thin and the handles aren't too massive.
Corning Museum of Glass Thanks for your reply, very informative. Maybe an additional question.. Was the kiln kept "on" at all times, and, how much glass does the pot contain?
***** The pot holds about 50 lbs. of soda lime glass. The annealer is shut down every night, the melting furnace is fed with wood and runs continuously.
So as someone who's interested in glassblowing (and have been since the old PBS Programme Glass with Vicki Payne), how difficult is it to build a kiln like that? Could I convert a coal forge to do the job?
Hi, we asked Bill Gudenrath your question and here is his response: "If you refer to the fact that the furnace in the video is wood fired, the best place to find information about that is within the website called georgianglassmakersco.uk . It is the web home-base of David Hill and Mark Taylor, who live and work near Salisbury, England. They have built a number of wood fired glass furnaces and probably know much more about them than anyone else. If you look about their site, you’ll find their area about Roman glass; the wood-fired furnace information is under sub-headings called ‘furnace project’. Just poke around and you’ll find tons of information." Thanks for watching!
Cold working tools have been around for as long as we've cut gems. I've always figured they used some kind of cold working tool for 'crack off' in Roman era.
It's actually entirely fired by logs of seasoned wood. The design of the furnace achieves the temperature easily. The furnace is made of daub - a mixture of clay and a small amunt of chopped hay. It can easily reach temperatures of welll over 1200 degrees Celcius. More at www.glasofenexperiment.de/
hi Toby, here's an answer from Bill Gudenrath: To the best of my knowledge, David Hill, the very talented British artist who made the moulds in the video-his business partner Mark Taylor is the primary glassblower-sculpts a positive from plaster, then presses the clay onto it. After the clay is ‘leather-hard’, he cuts the seams, disassembles it and fires the mould. If you explore their website georgianglassmakers.com, you might find more information on mouldmaking. Thanks for watching!
+TheShowMan --Mark Taylor and David Hill sell these. Search 'Roman Glassmakers' or 'Georgian Glassmakers' for their website. There you can find information on their replicas and how to buy them. Thanks for the inquiry!
David Hill, who made the molds in the video, does indeed fire the molds before their use in glassblowing. Their interiors are well-coated with soot (carbon) as a release-agent to prevent the glass from sticking. They are also pre-heated somewhat before use. Thanks for watching!
![KSI - Dirty [Official Visualiser]](http://i.ytimg.com/vi/VoDh1h1dPUE/mqdefault.jpg)
Thanks CMOG. It's one thing to see the pieces in the museum and be told how they're made, it's so much more fascinating to see it happen.
(BTW... I'm selling my tools and buying a stick.)
Fascinating stuff
Thanks so much to all
Wow! Fantastic artistry.
Thanks for watching!
This was so interesting! The molds are so cool.
Amazing techniques.
Thanks for watching, Miriam!
Excellent video.
What a wonderful experience! Thank you so much.
Thanks for watching, Theodora!
brilliant and fascinating, thanks Bill!
Great glassblowing demo and post.
Thanks for watching!
Great video!
I really enjoy the historical aspect of this video. I have just one question regarding "cracking off" I know this is a really old method which I have used myself. In recent times this is achieved with a torch, but this tool was not available in Roman times.
Historically what instrument would they use to apply the heat needed for this technique?
They would have used a hot thread of glass wrapped around the vessel, or perhaps a hot wire - either to encircle the vessel at a predetermined point and shock the glass - inducing a crack to run around the circumference.
Ah, interesting! Thank you for the response, I love all of your videos, can't wait to see more!
NolanSyKinsley a torch is in fact a very old tool. It was used in the ancient Egipt , as by many old civilizations , as the Maia , in central America
Er - what evidence do you have for this? Do you have a picture of one?
I have seen egiptian jewelers working with a torch in ancient bas reliefs ; any ancient jeweller had to use a torch in order to soldering gold or silver
Can you please show and tell about such a glass melting furnace at 2:35 ? How is it made and what materials is it made of? There are no such videos on the Internet !
i love it it's intriguing to watch
I love watching the videos on this cmog channel! Everytime interesting and eductive.
This is excellent craftmanship.
Wondering how they control the annealing with these (wood) fires?
Wood fired annealers are challenging to keep steady, but the chamber is kept fed with heat and by changing the flue opening, more heat can be let in or let out. To cool the work down, the fire is left to slowly dwindle, while the chamber is sealed. The heat from the walls of the chamber radiates inward and helps temper how fast the chamber cools. Fortunately, the glass is thin and the handles aren't too massive.
Corning Museum of Glass
Thanks for your reply, very informative.
Maybe an additional question.. Was the kiln kept "on" at all times, and, how much glass does the pot contain?
***** The pot holds about 50 lbs. of soda lime glass. The annealer is shut down every night, the melting furnace is fed with wood and runs continuously.
So as someone who's interested in glassblowing (and have been since the old PBS Programme Glass with Vicki Payne), how difficult is it to build a kiln like that? Could I convert a coal forge to do the job?
Hi, we asked Bill Gudenrath your question and here is his response: "If you refer to the fact that the furnace in the video is wood fired, the best place to find information about that is within the website called georgianglassmakersco.uk . It is the web home-base of David Hill and Mark Taylor, who live and work near Salisbury, England. They have built a number of wood fired glass furnaces and probably know much more about them than anyone else. If you look about their site, you’ll find their area about Roman glass; the wood-fired furnace information is under sub-headings called ‘furnace project’. Just poke around and you’ll find tons of information." Thanks for watching!
Cold working tools have been around for as long as we've cut gems. I've always figured they used some kind of cold working tool for 'crack off' in Roman era.
Probably a glowing hot iron
Very simple process. Nice video.
Thanks for watching!
Thank you very awesome video
Thanks for Watching!
that's so ingenious
Incredibly skilful.
Thanks for watching!
when you say "blown hard," is that with the mouth through the pipe, or is there some kind of blower device??
Hi jaykay415, no blower device, just human breath.
Tanks
the question is what is the oven made of and how hot does it get??.... also, what the fuel charcoal??
It's actually entirely fired by logs of seasoned wood. The design of the furnace achieves the temperature easily. The furnace is made of daub - a mixture of clay and a small amunt of chopped hay. It can easily reach temperatures of welll over 1200 degrees Celcius. More at www.glasofenexperiment.de/
4:46 Safety first!
Very informative. Thanks.
Thanks for watching!
How were the molds made in Roman times? Was it a lost-wax process?
hi Toby, here's an answer from Bill Gudenrath: To the best of my knowledge, David Hill, the very talented British artist who made the moulds in the video-his business partner Mark Taylor is the primary glassblower-sculpts a positive from plaster, then presses the clay onto it. After the clay is ‘leather-hard’, he cuts the seams, disassembles it and fires the mould. If you explore their website georgianglassmakers.com, you might find more information on mouldmaking. Thanks for watching!
@@corningmuseumofglass Thanks for replying. BTW the site is www.georgianglassmakers.co.uk/ which directs you to www.theglassmakers.co.uk/index.htm
Does anyone know where I could buy replicas of these roman cups
+TheShowMan --Mark Taylor and David Hill sell these. Search 'Roman Glassmakers' or 'Georgian Glassmakers' for their website. There you can find information on their replicas and how to buy them. Thanks for the inquiry!
Are the terra cotta moulds bisque fired?
David Hill, who made the molds in the video, does indeed fire the molds before their use in glassblowing. Their interiors are well-coated with soot (carbon) as a release-agent to prevent the glass from sticking. They are also pre-heated somewhat before use. Thanks for watching!
4:16 he was about to put it in that thing hahaha
but great vid i enjoy watching them so much
Caitlyn Hutabarat wasn’t he just gravity gathering the blob before it was placed in- it was a manoeuvre before it was put in not a mistake
Zaista volim staklom....koliko znanja i iskustva moraju imati
Thanks for watching!
Sjajni majstori stakla...ali i mi imamo majstora prve klase- naš MARKO u Muzeju antičkog stakla u Zadru....
Gesù et Maria! That blue cup is gorgeous! Click 1:55 for its chapter ʕ•́؈•̀ʔ
this video "blows hard" 0:32
ITV I learned ancient Rome had all the technology to manufacture Mason Jars but lacked the idea.
i have one made from class roman class