Crown glass or Cylinder?
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ChrisJ



Joined: 17 Jul 2012
Posts: 13

PostPosted: Wed Aug 08, 2012 7:59 am    Post subject: Crown glass or Cylinder? Reply with quote

You may have seen another post of mine in the "All Other" forum. I've tracked our house back as far as 1874 but have not found more information yer.

I tried to take a picture to show distortion in one of the windows in the oldest section of our house, though they came out poor and do not show the lines in the glass.

All windows have 12"x24" panes and are 2 over 2. Newer sections of the house clearly have cylinder glass as they have pretty straight horizontal lines in the panes.

The older windows have slightly curved lines as well as larger bubbles and defects. Is there a chance this is crown glass? Was anyone producing crown glass after 1850?

Again I apologize for the quality of the pictures. The window and storm window really needs to be cleaned. The storm window was not producing any obvious distortion. Though the pictures do not show the lines, they do give an idea of how distorted the image through the glass is. The windows in the newer areas of the house are distorted some, but not nearly as bad.

I'm assuming they are cylinder glass, though poorly quality than the newer glass in the house. Being I'm new at this I'd like opinions from others.

https://sphotos-a.xx.fbcdn.net/hphotos-snc6/217995_10151131234176253_617689560_n.jpg

https://sphotos-b.xx.fbcdn.net/hphotos-snc6/259781_10151131234056253_603233170_o.jpg


Thank you for your time.

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Don Wagstaff



Joined: 09 Sep 2010
Posts: 100

PostPosted: Wed Aug 08, 2012 3:46 pm    Post subject: Reply with quote

Hello,

Yeah, there is something showing up. Maybe you can get pictures of the refractions on the wall opposite the window or direction of light coming through. I know this is where I often notice the strongest effect from my old glass.

Greetings,

Don Wagstaff
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johnleeke
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Joined: 20 Aug 2004
Posts: 2972
Location: Portland, Maine, USA

PostPosted: Thu Aug 09, 2012 6:33 am    Post subject: Reply with quote

Here is the discussion on glass with the types and common dates.
http://historichomeworks.com/forum/viewtopic.php?t=1793
Your earlier glass sounds like it could be hand-blown cylinder glass and the later glass may be machine produced cylinder.

Sometimes distortion of the glass can be shown more clearly with video.

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Last edited by johnleeke on Thu Aug 09, 2012 11:56 am; edited 1 time in total
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ChrisJ



Joined: 17 Jul 2012
Posts: 13

PostPosted: Thu Aug 09, 2012 8:57 am    Post subject: Reply with quote

johnleeke wrote:
Here is the discussion on glass with the types and common dates. Your earlier glass sounds like it could be hand-blown cylinder glass and the later glass may be machine produced cylinder.

Sometimes distortion of the glass can be shown more clearly with video.


Thank you for the responses.

John, I don't see your link to the discussion? I tried finding it my self on the site and was not successful.

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johnleeke
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PostPosted: Thu Aug 09, 2012 11:56 am    Post subject: Reply with quote

Oops. Sorry. Here is the link on glass:

http://historichomeworks.com/forum/viewtopic.php?t=1793

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by pen and thought best words are wrought
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