No-one likes general adverts, and ours hadn't been updated for ages, so we're having a clear-out and a change round to make the new ones useful to you. These new adverts bring in a small amount to help pay for the board and keep it free for you to use, so please do use them whenever you can, Let our links help you find great books on glass or a new piece for your collection. Thank you for supporting the Board.

Finding the glass pieces you need for your collection involves keeping an eye on the right searches.
From Akro Agate to Vasart, whatever you collect you'll find a quick easy place to search on glass-seek.com

Author Topic: Machine made glassware — Safety Rim: any input?  (Read 1247 times)

0 Members and 1 Guest are viewing this topic.

Offline David E

  • Author
  • Members
  • ***
  • Posts: 3828
    • Heart of the Country, England
    • ChanceGlass.net
Re: Machine made glassware — Safety Rim: any input?
« Reply #10 on: February 23, 2007, 02:29:06 PM »
Connie: the single tiny bump is present and as you describe: an artefact of manufacture. Thanks.

There is also a slight thickening of the rim, so I imagine this was deliberate.
David
► Chance Additions ◄
The 2nd volume of the domestic glassware of Chance Brothers
Contact ► Cortex Design ◄ to order any book

Support the Glass Message Board by finding a book via book-seek.com


Offline Frank

  • Author
  • Members
  • ***
  • Posts: 9396
  • Gender: Male
    • Glass history
    • Gateway
Re: Machine made glassware — Safety Rim: any input?
« Reply #11 on: February 23, 2007, 02:44:04 PM »
... question as to whether the Dema glasses had a deliberate safety rim...
Deliberate
Frank A.
Please help preserve glass web-sites for posterity by donating to The Glass Study Association a non-profit organisation.
Scotland's Glass - Ysart Glass
Glass Zoo - Glass Study.COM
Commercial Czech

Support the Glass Message Board by finding glass through glass-seek.com


Offline Adam

  • Glass Professional
  • Members
  • ***
  • Posts: 355
  • Sowerby 1949-56, Davidson 1956-61, Jobling 1961-72
Re: Machine made glassware — Safety Rim: any input?
« Reply #12 on: February 23, 2007, 09:34:07 PM »
Many blown items (except those which are entirely hand-finished over the chair and bottles) have to be separated at some stage from the "moil", or whatever term is used locally for the bit which has either been attached to the blowing iron or where the blowing head of the machine has located.  The better-quality ones are cracked off and the rim ground, perhaps bevelled, and polished to give essentially a flat top.

With cheaper and/or mass produced items it is common for the article to be held upside down and the moil "burnt off".  The latter is a common term but of course glass won't burn - "melted off" would be more accurate.  A ring burner (gas/air or gas/oxy) is applied while the article is rotated until the moil drops off.  The resulting beaded edge is unavoidable and is an effect of surface tension.  It will of course add strength to the edge but that is sheer good luck and a bonus for the marketing people.  As the moil drops off, the last point of contact results in a slight string which immediately melts back to form the tit or pip.  This is always present and varies from very obvious to almost invisible.  Most people aim for the latter.

Adam D.

Support the Glass Message Board by finding a book via book-seek.com


Offline David E

  • Author
  • Members
  • ***
  • Posts: 3828
    • Heart of the Country, England
    • ChanceGlass.net
Re: Machine made glassware — Safety Rim: any input?
« Reply #13 on: February 23, 2007, 10:20:40 PM »
Many thanks Adam! :D
David
► Chance Additions ◄
The 2nd volume of the domestic glassware of Chance Brothers
Contact ► Cortex Design ◄ to order any book

Support the Glass Message Board by finding glass through glass-seek.com


 

Look for glass on
ebay.co.uk
Look for glass on
eBay.com (US)

Link to Glass Encyclopedia
Link to Glass Museum


This Website is provided by Angela Bowey, PO Box 113, Paihia 0247, New Zealand