A look at what is currently available on eBay
 5 1/2" Pink Depression Glass Berry Bowl - Etched Flower Motif US $6.95 
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 DEPRESSION GLASS, IMPERIAL GLASS CO, CROCHETED CRYSTAL, 6 1/4" BOWL US $15.99
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 COLLECTIBLE GREEN DEPRESSION GLASS BOWL US $6.99
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 Antique Vintage Pink Glass Bowl Floral Etched Depression US $7.45
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 Vintage Clear Depression Glass Candy Bowl US $6.99
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 Vintage Depression Glass Amber Creamer & Sugar Bowl/Toothpick Holder US $2.50
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 Amber Depression Glass Normandie Berry Bowl US $20.50
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 Carnival or Depression Glass Bowl with Birds US $6.51
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 Beautiful Serving Bowl and Platter Depression Glass US $5.00
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I am trying to make a pipe out of glass beer bottle using blowtorch makes good bowl but breaks on cooling idea
empty glass beer bottle heated with blow torch on side 3/4 to bottom small bowl depression forms and hole is formed at bottom of bowl looks to make a kick ass pipe but cooling in air it shatters around one minute afterwards tried heating the surrounding arear of bowl to aid in slower cooling but similar effect was noted although less breaking occurred mainly just minor cracking any ideads ive read that glass has a transition tempurature but do work with glass
Yo:
You have a thermal shock problem. Pyrex glass cools in air but it has a very low coefficienr of expansion. It also has a lot of Boron in its mix. But most glass is not pyrex.
The trick is to cool the glass very slowly. The industry also cools their glass very slowly ,after working with it. ( e.g. after glass blowing, casting, pressing, or blow molding.)
They place the completed pieces into an oven called a lehr, to slowly cool the glass down to room temperature.
Slow cooling eliminates the strain in the glass set up after the above manufacturing procedures.
I would lower the emperature of the oven from its max (500 degrees F.), to room temperature at the rate of 10 degrees every hour. (you might get away with 15 degrees, try it and see). Is such annealing a pain; you bet. So get some buddies to take turns babysitting the oven, 24 hours a day for 50 hours, or rig up a device that lowers the temperature automatically..
I cannot give you more precise time and temperatures because I do not know the composition of your glass nor the configuration of your final product.
Please note that the kitchen oven's maximum temperature may not be hot enough. (if so, contact a potter or copper enameller and do it in their kilns.
Good luck.
Dan the Anewers-Man.
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