The surplus center in Lincoln Nebraska sells a long, skinny squirrel- cage blower with a rectangular discharge which is 1.25" by 11.25". The downside, it's...
2321
Owen Brazell
obrazell
Jan 1, 2002 5:49 pm
There are a number of other people in the UK who might make such a mirror including Jon Owen and AE Optics. A mirror that fast will be difficult to make and...
2322
chuckfellows
Jan 1, 2002 6:09 pm
I'm still pretty new to this and am trying to learn as much about my scope as I can. I've been trying to do a star test on my 12.5", F5 DOB using a 4mm Radian...
2323
newsalisbury
Jan 1, 2002 6:30 pm
... my ... scope ... pool, ... rings. ... diffraction rings. i always see the diffraction rings but usally you can see swirling going on due to tube currents...
2324
William Byrd
web0178213
Jan 1, 2002 7:41 pm
Hi Chuck! ... From: "chuckfellows" <chuckfellows@...> To: <bigdob@yahoogroups.com> Sent: Tuesday, January 01, 2002 12:09 PM Subject: [bigdob] Viewing...
2325
Jim Miller
jtmiller95746
Jan 1, 2002 7:50 pm
When I first used my scope I found the same thing because it was badly out of collimation. Take some time to read the various collimation papers on the web...
2326
Doug Tanaka
dtanaka2001
Jan 1, 2002 9:22 pm
... Chuck, What you saw was very likely a combination of both, but probably more atmospheric since you say it was breezy. Also, if you saw swirling patterns,...
2327
chuckfellows
Jan 1, 2002 9:52 pm
Fast Ripples, star images were fuzzy, like not completely in focus. Thanks... Chuck ... pool, ... rings. ... would be...
2328
newsalisbury
Jan 1, 2002 10:04 pm
does any one have the oct. article downsizing your secondary mirror. that they could send me. www,budda1@.... thanks bob hart...
2329
kallen37
Jan 1, 2002 10:43 pm
Bob: Read this: http://www.weatherman.com/knisely2.htm Hope it helps! Kurtis ... will it ... best ... Service....
2330
William Byrd
web0178213
Jan 1, 2002 10:47 pm
Chuck: Sounds like high level atmospheric turbulence. That's exactly what I had during my last observing run a few weeks ago. Over the course of about 75 ...
2331
Jim Miller
jtmiller95746
Jan 1, 2002 11:10 pm
you can basically get all you need by downloading the software from http://www.skypub.com/resources/software/sec.html have fun jtm ... From: newsalisbury To:...
2332
newsalisbury
Jan 2, 2002 12:55 am
... 2.6 is a waste of time; going from a 21% to 17% will not make any difference . i have read alot of articles on this including daves and will keep my 3.1....
2333
newsalisbury
Jan 2, 2002 1:05 am
Has any one dealt with modern glass tecknology ASM product. or their mirror any good. thanks bob hart...
2334
twenty4_7spy
Jan 2, 2002 3:39 am
Chuck, I live in Glendale and it was *windy* last night, to the point where star testing would be impossible. You were seeing big-time atmospheric turbulence...
2335
chuckfellows
Jan 2, 2002 4:54 am
Thanks, Matt, glad someone else shared the experience. Now I know what atmospheric turbulence looks like! Chuck Fellows...
2336
Jan van Gastel
janvangastel
Jan 2, 2002 7:05 am
You will not notice any difference (given equal quality of the flats). Jan http://www.geocities.com/janvangastel/ ... From: kallen37 <underwater@...> ...
2337
Shawn Arbuckle
shawnarbuckle
Jan 3, 2002 3:05 am
Bob- I ground my 18" mirror with the BVC glass about 2 years ago. Andre (the owner) seems to be a nice and honest guy. At the time, he didn't accept credit...
2338
albireoblue
Jan 4, 2002 12:18 am
Wow! What a cool site! Nice job, indeed. -Becky...
2339
Art DeBrito
ionheavens
Jan 4, 2002 11:36 pm
I see you already have Rocky Mountain Star Stare. Thanks for including it. Let me give all an open invitation to the Star Stare. We have a great time in the...
2340
atmaking
Jan 5, 2002 12:18 pm
Hi, Was looking for "old messages" in the archive and see your post, sorry not to answer before. I have bought some carbon tubing for my current project....
2341
setiaw
Jan 7, 2002 9:47 pm
I have LX200 12" telescope for sale. I only used it twice because it's too big and heavy to me. The total weight including tripod is 120 pounds. The telescope...
2342
mkeveney
Jan 8, 2002 6:43 am
...I've seen a few six-tube scopes but the vast majority seem to be eight? Is it easier to make or something? ..Seems like it would be, well, 25% lighter. Is...
2343
Jim Miller
jtmiller95746
Jan 8, 2002 6:57 am
I'm currently building a 6 pole truss dob so I'll give you my guesses. There aren't a lot of examples to work from. Examples make things easier. I'm having...
2344
Robert Leyland
r_leyland
Jan 8, 2002 7:01 am
I think 6 trusses will impinge on the light path. i.e the triangle formed by the trusses will be inside the mirror circle, where a square is outside the...
2345
Vegos
rogue_river
Jan 8, 2002 7:55 am
Matt: In the typical Dob 8 tube scopes are far easier to fabricate. If the design is fairly compact, 6 tubes will likely involve compound angles at the lower ...
2346
newsalisbury
Jan 8, 2002 12:43 pm
I like the starmaster or nightsky design.It uses 4 triangels trusses one for eack side.I JUST RECEIVED MIND AND IT WORKS GREAT.There is 8 poles but just 4...
2347
mkeveney
Jan 8, 2002 9:29 pm
... Mr. Miller (nice site, btw) & Mr. Leyland also alluded to compound angles, light paths, etc... but I don't see what the problem is: The tubes (as viewed...
2348
Jim Miller
jtmiller95746
Jan 9, 2002 12:56 am
You're right! But you need to take a few things into account. First the hexagon must circumscribe the lightpath meaning the perpendicular distance from the...
2349
Jim Miller
jtmiller95746
Jan 9, 2002 12:59 am
BTW, compound angles for me were solved by using a ball and socket approach from www.focuser.com at the bottom and joining the tops with a offset angle bracket...
