Good idea Jack. I have placed in my folder (Janvangastel), Jan http://members.ziggo.nl/jhm.vangastel/Astronomy/ ... From: jacques To: atm_free@yahoogroups.com ...
21319
atm_free@yahoogroups....
May 23, 2012 3:45 pm
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the atm_free group. File :...
21320
savardjacques@...
savardjacque...
May 23, 2012 6:38 pm
anybody ahave experience in making long focal lense like F=60 for a 4 or 6 inch dis is it possible to do it ike any atm mirror wit the same stuch jack...
21321
art.bianconi
May 23, 2012 9:20 pm
Hello Jack! I only know of two men who can answer that question on the basis of personal experience: Ed Jones and Dick Parker. These two men are NOT arm chair...
21322
Mark Whitaker
tnut55
May 24, 2012 12:15 am
Check out the refractor project at ASGH.org by Dick Parker. ________________________________ From: art.bianconi <artbianconi@...> To:...
21323
art.bianconi
May 24, 2012 11:51 am
Hi Mark! There is an photo image floating around of what appears to be an English mount (?), solid brass and polished, which has Dick's name attached to it....
21324
Mark Whitaker
tnut55
May 24, 2012 12:11 pm
You are probably referring to his Clark mount reproduction which can be seen over at the astromachist group. Mark ________________________________ From:...
21325
Mark Christensen
mjcw500@att.net
May 24, 2012 4:10 pm
See the article on page 304 of "The Best of ATM, Vol 2". The gent made a pair of f/50 70mm singlets. Because they are smaller in diameter they would be harder...
21326
art.bianconi
May 24, 2012 6:08 pm
Stephen Richard is the owner/principal of Verrier studios in Glasgow, Scotland. While accomplished as an artist and a respected authority on working with...
21327
kelly Letourneau
letourn111
May 24, 2012 8:34 pm
there are videos at the foreilly1958 youtube channel and I saw three other videos and a long thread on CN. ...
21328
art.bianconi
May 25, 2012 2:19 am
Thank you Mark! Yes . . . . . THAT is the one! It reminds me of an era when human hands made things, not machines, hands that took pride not just in function...
21329
art.bianconi
May 25, 2012 5:01 am
I spent the better part of an hour drooling over the photos. Downloaded every one! That entire project was reverse engineered using SolidWorks Mechanical ...
21330
Cody Lawson
cody_lawson
May 26, 2012 12:05 am
Awesome links all around guys. Orion thanks for some serious pointers there to. I have been meaning to ask about the joint issue and had even considered...
21331
Orion_60640
May 26, 2012 2:40 pm
... Welded would be nice - fast to assemble and folds flat. If you have the budget for it ... ... I can't speak to all connectors. I've been happy with...
21332
art.bianconi
May 28, 2012 3:13 am
In a few weeks I will be driving to Tobermory Peninsula in Quebec, Canada. That is the southern shoreline of Georgian Bay and East of Lake Huron. I've planned...
21333
Greg Furtman
gregfurtman
May 28, 2012 10:54 am
Art, Here you go. http://www.weatheroffice.gc.ca/canada_e.html Greg Furtman 27426 County Rd H Webster, WI 54893 <blocked::http://home.centurytel.net/starguy/> ...
21334
Tim Ulmer
tsulmer1
May 28, 2012 7:40 pm
Here is a canadian site that gives seeing and observing predictions across north America . http://cleardarksky.com/csk/ Tim in Calgary ...
21335
art.bianconi
May 29, 2012 8:47 am
I don't see Blanchard grinding mentioned much amongst glass pushers these days. Perhaps it is just assumed to have been done? I've reasoned that the primary...
21336
art.bianconi
May 29, 2012 8:50 am
Thanks Tim! I'll check it out Art...
21337
Mark Christensen
mjcw500@att.net
May 29, 2012 2:59 pm
Art, Back in the day, when we were both younger, nobody worried about this because we all used thick (1:6) mirror blanks. It became a concern (and to some a...
21339
art.bianconi
May 29, 2012 3:32 pm
Thanks Mark. It's as I expected: more of an unwarranted preoccupation with perfection than a justified attribute. I thought perhaps that by providing equal...
21340
trulyyours05
May 29, 2012 3:50 pm
I want to strongly endorse Steve's opinion. Joints that are held together by fixtures are not tight against flex. I use securely bolted connections in a...
21341
mbartels@...
Mel_Bartels
May 29, 2012 4:23 pm
... <<< Not sure what you are saying here, but I found in my large thin mirror blanks that if the wedge exceeded 0.004 inches then astigmatism usually...
21342
mbartels@...
Mel_Bartels
May 29, 2012 4:23 pm
... <<< Not sure what you are saying here, but I found in my large thin mirror blanks that if the wedge exceeded 0.004 inches then astigmatism usually...
21343
art.bianconi
May 29, 2012 4:46 pm
I see your point Mel and it makes a lot of sense. In fact Mark made uniformity of flexture a consideration, one which I overlooked when rsponding. "The idea...
21344
Orion_60640
May 30, 2012 2:18 pm
... That is a pretty sweeping generalization. Perhaps you have some empirical data that shows commercial connectors move more than collimation tolerance? Any...
21345
careysub
May 30, 2012 8:35 pm
... However, if you go with a Serrurier STRUT design, almost all of those joints and connections simply go away. The idea is to use parallel struts that extend...
21346
Mark Christensen
mjcw500@att.net
May 31, 2012 12:01 am
To clarify this and maybe (Art) to help you, for thin blanks making them of uniform thickness AND supporting them well is important. My reference to 'fetish'...
21347
art.bianconi
May 31, 2012 2:24 am
Thanks Mark! It all makes sense. However, the development work on slumped mirrors has been put on hold by all of us with active kilns while we explore ...
21348
trulyyours05
May 31, 2012 2:56 am
You have produced your opinion and I have produced a working scope as well. Many thousands of people have and I'm sure they all have opinions about telescopes....
