http://groups.yahoo.com/group/atm_free/ Amateur Telescope Making Sat, 25 May 2013 23:22:37 GMT John http://groups.yahoo.com/group/atm_free/message/23471 http://groups.yahoo.com/group/atm_free/message/23471 Having seen it happen multi million quid wise more than once there is a tendency to worry about ones job. Get by some how and hope to find another quickly and Sat, 25 May 2013 23:12:49 GMT John http://groups.yahoo.com/group/atm_free/message/23470 http://groups.yahoo.com/group/atm_free/message/23470 LOL John Sat, 25 May 2013 22:36:22 GMT aplanatic@... http://groups.yahoo.com/group/atm_free/message/23469 http://groups.yahoo.com/group/atm_free/message/23469 Very interesting, Dale. Do you know how many waves of astigmatism was in the mirror in the "before" picture? In the 42" that we figured at El Camino College in Sat, 25 May 2013 21:27:47 GMT Dale Eason http://groups.yahoo.com/group/atm_free/message/23468 http://groups.yahoo.com/group/atm_free/message/23468 There is a group woking a 40 inch F3.6 and I have been helping them understand how to use interferometry and OpenFringe to test it. Here is a sample Sat, 25 May 2013 20:40:20 GMT Mike Coslo http://groups.yahoo.com/group/atm_free/message/23467 http://groups.yahoo.com/group/atm_free/message/23467 ... I do kind of like the star test. The eyes open are handy at that point. Actually, I never quite trust myself with testing. - Mike - Sat, 25 May 2013 20:37:50 GMT Mike Coslo http://groups.yahoo.com/group/atm_free/message/23466 http://groups.yahoo.com/group/atm_free/message/23466 ... They took the typical path, which is to believe the more sensitive test. After all, being more sensitive, it had to be better - right? - Mike - Sat, 25 May 2013 18:43:27 GMT atmpob http://groups.yahoo.com/group/atm_free/message/23465 http://groups.yahoo.com/group/atm_free/message/23465 Richard 1941 how did you spoof Mel's email address? Sat, 25 May 2013 16:57:40 GMT Mel Bartels http://groups.yahoo.com/group/atm_free/message/23464 http://groups.yahoo.com/group/atm_free/message/23464 Same thing we do when software unit tests fail working code. Think of it: you have tests and code to maintain, to learn, to get correct. Now you have to learn Sat, 25 May 2013 16:40:27 GMT atmpob http://groups.yahoo.com/group/atm_free/message/23463 http://groups.yahoo.com/group/atm_free/message/23463 Yes, but what do you do if the two tests don't agree. How do you decide which one to believe. That was the Hubble managers delima. I see that my Hubble law Sat, 25 May 2013 12:25:15 GMT John http://groups.yahoo.com/group/atm_free/message/23462 http://groups.yahoo.com/group/atm_free/message/23462 Actually despite cost savings being mentioned in the news even before it was put up there all sorts of things are possible. There was even a stage when the Sat, 25 May 2013 09:56:02 GMT Nils Olof Carlin http://groups.yahoo.com/group/atm_free/message/23461 http://groups.yahoo.com/group/atm_free/message/23461 John, ... omit a 2nd test. It isn't difficult to imagine what proportion of total project costs that would be. It was not omitted: "The panel found, for Sat, 25 May 2013 08:57:21 GMT John http://groups.yahoo.com/group/atm_free/message/23460 http://groups.yahoo.com/group/atm_free/message/23460 The real problem with Hubble was cost saving Vladimir - deciding to omit a 2nd test. It isn't difficult to imagine what proportion of total project costs that Sat, 25 May 2013 07:25:42 GMT Vladimir http://groups.yahoo.com/group/atm_free/message/23459 http://groups.yahoo.com/group/atm_free/message/23459 Paul, Remembering the Hubble mirror scandal I can not help to think that in quoted text you were justly sarcastic. ... From: paul valleli Vladimir, Nils, It Sat, 25 May 2013 07:13:35 GMT Vladimir http://groups.yahoo.com/group/atm_free/message/23458 http://groups.yahoo.com/group/atm_free/message/23458 Guy, Alan and Bill, Congratulation on success. This message makes me a day. Guy, your previous attitude to Bath interferometry maketh me believe that you will Sat, 25 May 2013 06:16:12 GMT paul valleli http://groups.yahoo.com/group/atm_free/message/23457 http://groups.yahoo.com/group/atm_free/message/23457 Guy, One other thing, If you cannot control the fringe pattern for number of rings with an RoC shift or change the "wedge" with the translation screws, you may