Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
neo
professor emeritus
Reged: 02/12/08
Posts: 723
Loc: Iasi, Romania
|
Re: Anything to be done with a stressed blank?
10/15/09 03:54 AM
|
|
|
John, your post came jast at the right time. I was actually asking myself how those portholes were made. A guy from our local astronomy forum, living near the Black See in Constantza, a portuary city, promised me he can get me a 400 (~16") 30mm thick piece of glass from an old ship. He said the glass is in one piece, not tempered. Would be worth the trouble to consider pushing the ol' chunk of glass into a god parabola?
--------------------
Russian 15x50 binos
Home made 8" f/5 Newton on eq mount
Home made 70mm f/6 (Rodenstock Rotelar lens) Apo refractor
www.astronomy.ro
|
|
12 registered and 7 anonymous users are browsing this forum.
Moderator: Don W, Mike I. Jones
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Rating:
Thread views: 575
|
|
|
|
|
|
|
Previous
Index
Next
Flat
Edit
Reply
Quote
