... wrote: We have our own Indians here in California. I got the glass from my neighbor, Satish Warrier. It was a table top that got chipped. When are you...
Nothing much about telescopes in your message ! is there ?? <Can I get you to defect?> I dont think Mohit needs to defect If he wants to build telescopes, it...
You can do private replies; you just gotta type the address in by hand. (or if you’re computer literate, use cut and paste) It’s in the header info: who...
Greetings All, Finally got the last pages of information up regarding my Robo-Foucault tester. http://lerch.no-ip.com/atm Item 11.2 Rtaft_Release So, Now its...
... IIRC, there used to be two kinds of ceramic kilns, low fire and high fire (normal ceramics versus porcelain, I believe). The difference was the wall...
... Sounds like the high fire kind. The low fire kind that I remember had a spongy wall (like sponge glass) that was quite easy to put a prong through. Rick...
Hi, Just have a question regarding the correct secondary baffling of my 16" folded Newt. If I have a well placed baffle inside the focuser tube (i.e.. nicely...
From looking at the telescope that you pointed out, I would guess that the owners do not leave in an urban environment with a lot of stray light. I would also...
... From Peter to Peter, This is a "folded" Newtonian, meaning that the secondary is not set at 90 degree to the primary. The light cone from the secondary...
... it by baffling in any other tube. Assuming no vignetting of the field of view, some light leaks past the secondary into the field stop, no matter how well...
... Yes, you do need a baffle behind the secondary. Large? Depends on your goemetry of all the parts and what size unvignetted field you want. See: ...
Hi all, I have just completed building my first telescope over the summer. It is a 6" f/8 with a Dobsonian mount. The mirror I used for the primary is one I...
Hi Bob, First off, Where were you viewing from, inside the house, outside the house, in a very dark place or in a light infested back yard.... like me :( are...
Bob, There a lot of factors that will effect what you can see on any given night, as you no doubt know. City lights and atmospheric haze will reduce contrast,...
I have a Meade DS114 4.5" f/8 scope with decent optics and can see both eq belts on Jupiter and the Cassini Division on Saturn from urban skies if the seeing...
James, You should be able to fuse and slump in the same operation unless you're planning something ultra radical. You will want the ribs to be close to the...
John asked: #3 When Slumping, do you Slump OVER a mold or INTO a mold? John, 'Tis better to slump over the mould than into it. No place for the air to go...
Greetings All, For my next project, I'm working on slumping and fusing an 18" Cellular mirror. The point of the project is just something new to explore...
James, Please accept my apologies for calling you John! My other set of 10- fingers just got home from work, and I'm all better now! It's like having one of...
James writes: If interested, here's a link to the PLOP file I created: http://lech.no-ip.com/atm/Cell_Mirror.zip (Really Small!) James, I've tried several...
... given ... need ... inside ... There was a break in the weather last night and I managed to do some quick star tests on my mirror. It looks like the mirror...
Coyoté, I think I got my set of 10 fingers from the same store, since they don't seem to work so well either ;) Here's the corrected link for the PLOP file +...
Hi Bob. I have a 6" f/8 dob that I made and have experienced both great joy and disappointment. First of all, I live in San Diego, and it can get pretty dark...
Hi, Just to give a point of reference, I am near to the city of Toronto so light pollution is a big concern. The temperatures here vary widely from 10 to 25...
I would help you, but I don't think you surveyed the ATM archives to understand what goes wrong. Plaster of paris? A bad joke! Greenware? What are you,...
Got a question, If in the event a mirror had slight turned up edge, what would be noticed well observing? is there any tell tale signs to determine this,...
Rick, With most zone and edge problems on a focused image, you will notice only that your optics give fuzzy images. The more pronounced the turned up edge, the...
James wrote: My current thinking on forms to slump over is fired ceramics. I plan to make a plaster of paris master mold, pour ceramic 'Slip' into it to make ...
