Oval?
Do you mean egg shaped?
Yes those are designed for round bottom flasks.
I would suggest buying a heating and stirring mantel, if you can afford it. But a good stirrer will stir thru one of the fabric heating mantels.
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whoever said they had a glassblower whip them something out of his'her ass in five min. is either completely full of shit or is forgetting to add essential details
Hmmm... bit harsh. I'm estimating the 5 minutes but that's how long its taken him to make most modifications that I've watched him do. Now that I think of it, any flask modifications have been left with him overnight. He whipped a Claisen up from scratch in less than 4 minutes.
5 minutes making a piece of glassware is full of shit. Yes for some glassware that has blanks that dont need a lot of shit like a 1neck flask yes to a point. They just cut off the neck and have a blank with the right joint put on. But after they have to clean it thouroughly and thenthey bake it in a oven at 1000C for 12 hours to get rid of any stress or fractures that can be invisisble to the nacked eye but weaken youre glassware. And Dont worry avout the glassblowers turning you in. But dont go in there not looking the part and asking for all this shit that obvious you dont know shit about. Most glassblowers are extremmely friendly helpfull nice people. And most dont make a lot of money either. They want youre busuiness but dont putthem in bad spot. Swim has built nice relationships with several glassblowers and they are great. They have taught him lots about glassblowing and even have let him fashion a couple of items under thier supervision. Ask questions with them pick a part and go by it. Desighn some things anddiscuss the item with them. They love talking techincal. Swimhad them researching and discussing all sorts of stuff for him after he had them blow a special high pressure vessel that he designed. It involved electrical currents and they loved it. They wereintrigued by the special requirements needed and swim learned some that he had not thought of when he went into the desighning. Find out all you can about Borosicate glassblowing.[http://www.ecu.edu/chem/glassblowing/gb.htm#Introduction (http://www.ecu.edu/chem/glassblowing/gb.htm#Introduction)
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