Utah-Astronomy

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July 2013

48 participants
142 discussions

Non-astronomy but cool
by Joe Bauman 01 Jul '13

01 Jul '13

Dear Friends, the latest issue of TIME Magazine, dated July 8 and already delivered on the East Coast, has an article about my books on Revolutionary War veterans, with photos. The article is a short one on p. 2. The magazine has three photos and a reference to their Light Box feature, which will carry more details on-line as of July 4. You don't need a subscription to access the Light Box. That on-line site will have many more photos and descriptions, and I think links to my e-books, which can be purchased from Kindle and Nook. Thanks, Joe Bauman

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Anyone able to offer help w/ some issues w/ Ritchey-Chretien mirror set and tube?
by John M. Craig 01 Jul '13

01 Jul '13

Hi Folks, I've had a nice 10" RC-style Cass mirror set that has been, in fits and starts, making its way to becoming a telescope. After a long fit, I'm back into the start mode. I've run into some issues that I find I really need help with. If there's someone who'd be willing to spend some time coaching me, I'd be most grateful. If someone has, or knows of a place to do some testing of Cassegrain mirrors that would be extra helpful. One of the main issues I'm struggling with is trying to determine the correct separation of the mirrors. I know that can be determined quite well with a Ronchi test, but I've been unsuccessful in achieving a test setup that even allows me to see the lines. (Part of the difficulty is that the scope is not really fully put together and I'd appreciate some advice on how to proceed from where I am.) At any rate, if anyone has some time or knows of some sources to check into, I'd sure like to hear from you. (I'm located in Orem, and if more convenient, would happily come to you.) John

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