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Re: [ATM] ATM Digest, Vol 46, Issue 7
Congratulations on such a hard thing to do! it's more amazing than your
ability to understand and master this tough glass / lens design discipline ;).
I tried to help my dad for years but he just could not quit, he's still
going strong and has had emphezima for 2 decades God bless you both!
Roman Toledo
--- atm-request@atmlist.net wrote:
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> Today's Topics:
>
> 1. Anniversary (Richard F.L.R. Snashall)
> 2. Re: Fw: Draper articles (oh diepoes)
> 3. google (Nahtebe Nahtebe)
> 4. Re: Anniversary (Ken Hunter)
> 5. Foucault article (was re: Draper) (Matt Considine)
> 6. Re: Fused Quartz Blank (vorblesnak@peak.org)
> 7. Re: Fused Quartz Blank (Richard F.L.R. Snashall)
> 8. Re: Fused Quartz Blank (Jeff Rowe)
> 9. My 12.5 inch project (Francis J. O'Reilly)
> 10. Re: Fused Quartz Blank (Dale Eason)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 05 Oct 2007 05:13:47 -0400
> From: "Richard F.L.R. Snashall" <rflrs@rcn.com>
> Subject: [ATM] Anniversary
> To: ATM List <atm@atmlist.net>
> Message-ID: <4706004B.3070908@rcn.com>
> Content-Type: text/plain; charset=KOI8-R; format=flowed
>
> Made it another year without a cigarette! (130 mm f/6):
>
> http://users.rcn.com/rflrs/Ptz09-83x.atm ATMOS input file
> http://users.rcn.com/rflrs/Ptz09-83x.len OSLO input file
> http://users.rcn.com/rflrs/Ptz09-83x.txt TEXT prescription
> http://users.rcn.com/rflrs/Ptz09-83x.zmx ZEMAX input file
>
> Flat field -- 42 mm diameter (3.08 degrees). Visual Strehl
> seems good -- 0.9602 to 0.9316.
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 5 Oct 2007 11:24:48 +0200
> From: "oh diepoes" <ohdiepoes@gmail.com>
> Subject: Re: [ATM] Fw: Draper articles
> To: ATMList <atm@atmlist.net>
> Message-ID:
> <63c524650710050224y5c101988g791885a1b63e0061@mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Guy,
>
> Can you upload or send the article to me please? I love to read and
> see it. I have a few copies of the original papers such as the
> Schmidt-corrector, Bouwers-corrector, Lurie Corrector. For me these
> are very interesting documents to see their original thoughts and
> calculations, not just the results we work with today. I?d love to see
> them.
>
> Clear Skies,
>
> Yigal
>
> p.s. Yes Marc, you know me from the Dutch astroforum.
>
> 2007/10/4, Marc Fokker <ptp@extel.xs4all.nl>:
> > I would like to see the original, but I 'm also very interested in your
> > translation. I 've been several times to France, still my understanding of
> > french is very small.
> >
> > ----- Original Message -----
> > From: Guy Brandenburg
> > To: Marc Fokker ; ATMList
> > Sent: Thursday, October 04, 2007 10:25 PM
> > Subject: Re: [ATM] Fw: Draper articles
> >
> > I have a white-on-black photostat version of Leon Foucault's original
> > article from 1859, in French, which I translated a few years ago into
> > English. Would there be interest in seeing the original?
> >
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> >
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 5 Oct 2007 05:07:02 -0700 (PDT)
> From: Nahtebe Nahtebe <iim4rwtotr@yahoo.com>
> Subject: [ATM] google
> To: atm@atmlist.net
> Message-ID: <173624.48517.qm@web45608.mail.sp1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> http://google.com
>
>
>
>
____________________________________________________________________________________
> Yahoo! oneSearch: Finally, mobile search
> that gives answers, not web links.
> http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 5 Oct 2007 06:38:50 -0700 (PDT)
> From: Ken Hunter <atm_ken_hunter@yahoo.com>
> Subject: Re: [ATM] Anniversary
> To: "Richard F.L.R. Snashall" <rflrs@rcn.com>, ATM List
> <atm@atmlist.net>
> Message-ID: <796350.30816.qm@web52709.mail.re2.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> CONGRATULATIONS on breaking the cigarette habit!
> My mother fought hard to break the habit for 40 years
> then one day she stopped smoking, 3 days later she
> was laid to rest. It's a tough road, stay on it!
>
> Ken Hunter
>
>
> "Richard F.L.R. Snashall" <rflrs@rcn.com> wrote:
> Made it another year without a cigarette! (130 mm f/6):
>
> http://users.rcn.com/rflrs/Ptz09-83x.atm ATMOS input file
> http://users.rcn.com/rflrs/Ptz09-83x.len OSLO input file
> http://users.rcn.com/rflrs/Ptz09-83x.txt TEXT prescription
> http://users.rcn.com/rflrs/Ptz09-83x.zmx ZEMAX input file
>
> Flat field -- 42 mm diameter (3.08 degrees). Visual Strehl
> seems good -- 0.9602 to 0.9316.
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>
>
>
> ---------------------------------
> Be a better Heartthrob. Get better relationship answers from someone who
> knows.
> Yahoo! Answers - Check it out.
>
> ------------------------------
>
> Message: 5
> Date: Fri, 05 Oct 2007 16:21:00 -0400
> From: Matt Considine <matt@considine.net>
> Subject: [ATM] Foucault article (was re: Draper)
> To: atm@atmlist.net
> Message-ID: <47069CAC.7060105@considine.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Guy's translation of Foucault's article is also on my website :
> http://www.considine.net/mac/foucault/foucaultarticle.txt
>
> And, while we're at it :
> Brashear's contributions to "English Mechanic"
> http://www.considine.net/mac/em/brashear/
> Brashear on rock salt polishing
> http://www.considine.net/mac/jbrashearrocksalt.txt
> and
> Charles Hastings articles reprinted/discussed in "English Mechanic"
> http://www.considine.net/mac/em/hastings/
>
> Finally, as an aside, I identified for the folks at Hasting Historical
> Society one of Draper's
> original mirrors, which had been sitting un-identified on a shelf.
> Photos of that and other artifacts seen at my visit :
> http://www.considine.net/mac/draper/
>
> Hope these are of interest. I have a bunch of other old atm'ing type
> article which I'll eventually post as well.
>
> Regards,
> Matt Considine, F.R.A.S.
>
>
> ------------------------------
>
> Message: 6
> Date: Fri, 5 Oct 2007 17:12:43 -0700 (PDT)
> From: vorblesnak@peak.org
> Subject: Re: [ATM] Fused Quartz Blank
> To: atm@atmlist.net
> Message-ID: <1198.69.59.200.230.1191629563.squirrel@webmail.peak.org>
> Content-Type: text/plain;charset=iso-8859-1
>
> Well, I understand the task better now. He was hoping I would be
> interested in grinding these things for him. And I am interested, it is a
> new material for me. But! I don't get to keep the finished product.
>
> That said, he gave me one blank to start with. It is crystal clear, rings
> like a bell when tapped on the edge. 14.75 inches across. One good side,
> one side bunged up a bit.
>
> I'll keep you posted as I get into it. But I have two other pieces of
> glass ahead of it and a garage wall to finish.
>
> BTB: The 15.5 ultrathin got broken. I suspect a cat named Fats, but no
> evidence of course and the perpetrator will only answer one historical
> question. So I swept it up and started to think about the next attempt at
> ultrathin.
>
> David Davis
> Toledo, OR 97391
>
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Fri, 05 Oct 2007 20:35:05 -0400
> From: "Richard F.L.R. Snashall" <rflrs@rcn.com>
> Subject: Re: [ATM] Fused Quartz Blank
> To: atm@atmlist.net
> Message-ID: <4706D839.3070000@rcn.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> vorblesnak@peak.org wrote:
> >
> > BTB: The 15.5 ultrathin got broken. I suspect a cat named Fats, but no
> > evidence of course and the perpetrator will only answer one historical
> > question. So I swept it up and started to think about the next attempt at
> > ultrathin.
> Hmmm... has there ever been a study of the proportion of cat owners
> within the ATM community versus the public at large?;-)
>
>
> ------------------------------
>
> Message: 8
> Date: Fri, 05 Oct 2007 21:38:06 -0500
> From: Jeff Rowe <jeffrowe@austin.rr.com>
> Subject: Re: [ATM] Fused Quartz Blank
> To: "Richard F.L.R. Snashall" <rflrs@rcn.com>
> Cc: atm@atmlist.net
> Message-ID: <4706F50E.6020602@austin.rr.com>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> 2.5 cats here
> JR
>
> Richard F.L.R. Snashall wrote:
>
> >vorblesnak@peak.org wrote:
> >
> >
> >>BTB: The 15.5 ultrathin got broken. I suspect a cat named Fats, but no
> >>evidence of course and the perpetrator will only answer one historical
> >>question. So I swept it up and started to think about the next attempt at
> >>ultrathin.
> >>
> >>
> >Hmmm... has there ever been a study of the proportion of cat owners
> >within the ATM community versus the public at large?;-)
> >_______________________________________________
> >ATM mailing list http://www.atmlist.net/
> >
> >
> >
>
>
> ------------------------------
>
> Message: 9
> Date: Fri, 05 Oct 2007 22:46:36 -0400
> From: "Francis J. O'Reilly" <foreilly@verizon.net>
> Subject: [ATM] My 12.5 inch project
> To: "ATMList" <atm@atmlist.net>
> Cc: waa-programs@westchesterastronomers.org, seyyed mahmoud ghasemi
> <modeler72@yahoo.com>, "Joan M. O'Reilly"
> <joreilly@mahopaclawyer.com>,
> waa-webmaster@westchesterastronomers.org, Deena O'Reilly
> <deena@bestweb.net>
> Message-ID: <000601c807c3$2024f810$2f01a8c0@bulldogwbzt08i>
> Content-Type: text/plain; charset="Windows-1252"
>
> I just fed my cat. Unfortunately, the dog has acquired a taste for cat food.
> At least he hasn't acquired a taste for the cat.
>
> It is a quarter past ten at night. I am sitting at my computer typing about
> my ruminations concerning my 12.5 inch approximately f/7 telescope mirror. I
> have discussed this mirror before on the list, approximately two weeks ago.
>
> When I last addressed the issue, I had completed 7 1/2 hours polishing after
> fine grinding down to 3 micron AlO. There was no trace of grey on the mirror
> and I thought that I may have been complete, but I had some nagging doubts, I
> was concerned about a return based on looking at the glass with a laser.
> Looking at the glass in the sun, I noted a thin film, but I believe that to
> be due to my use of Cerium Oxide and my unique method of polishing which was
> taught to me by Bob Goff, which involves little more than the pressure of the
> weight of the glass during polishing.
>
> Last Friday night I took the mirror down to Guy Brandenberg's telescope
> making workshop, where Guy, looked at the mirror with a magnifying glass
> from Radio Shack and promptly showed me several pits that I decided needed to
> be addressed.
>
> I got home Saturday night and took the family out to dinner, Sunday we all
> went to Battery Park in NYC, Sunday night, I hot pressed the lap and resumed
> polishing the mirror with 30 minutes of tool on top. Previously I had
> polished for 3 1/2 hours with the tool on top and 4 hours with mirror on top.
> Since then, I have polished another five hours, One hour per day, half an
> hour in the morning before work and half an hour at night when I come home. I
> have expended a total time of thirteen hours to date. All polishing is
> equally split between tool on top and mirror on top.
>
> I should note that when I went to Guy's mirror workshop, We put the mirror on
> a test stand and looked at some Ronchi images. (He has a real interesting
> test stand with a strap device to hold the mirror and a versatile testing
> apparatus complete with a round device that can change positions to allow
> knife edge readings and three different settings for different density Ronchi
> screens.) The mirror's figure was very smooth, all the way to the edge, no
> TDE at all, but to my dismay, It was not perfectly spherical, as I thought it
> should be, but rather was on it's way to being a parabola. I attribute this
> to the half hour extra time of mirror on top at the time of the test, but
> what do I know?
>
> Back to the main issue, At what point do I call it good and start figuring
> this piece of glass? I am pretty much committed to going another seven hours
> of polishing for a total of twenty hours, That should take care of most of my
> pits, actually there are very few left at this time. Probable less than one
> per square inch at the edge. I doubt that it will make much of a difference
> at that level, none in the center or for that matter none more than an inch
> from the edge.
>
> I'd like to hear your input on the topic.
>
> Best regards to all,
>
> Francis J. O'Reilly
>
> ------------------------------
>
> Message: 10
> Date: Fri, 5 Oct 2007 19:50:58 -0700 (PDT)
> From: Dale Eason <atmpob@yahoo.com>
> Subject: Re: [ATM] Fused Quartz Blank
> To: atm@atmlist.net
> Message-ID: <127417.30940.qm@web50603.mail.re2.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> David,
>
> You may have finally answered the question we often
> see. How thin is too thin. Now we know the answer
> is, If a cat can break it, it is too thin.
>
> I didn't break it nor did the post but that darn
> cat... Darn I was was hoping to measure it once more
> after you had it "figured out".
>
> Concerning the Fused Quartz. I don't think I would
> agree to grinding just for the fun of it.
>
> Dale Eason
>
> --- vorblesnak@peak.org wrote:
>
> > Well, I understand the task better now. He was
> > hoping I would be
> > interested in grinding these things for him. And I
> > am interested, it is a
> > new material for me. But! I don't get to keep the
> > finished product.
> >
> > That said, he gave me one blank to start with. It
> > is crystal clear, rings
> > like a bell when tapped on the edge. 14.75 inches
> > across. One good side,
> > one side bunged up a bit.
> >
> > I'll keep you posted as I get into it. But I have
> > two other pieces of
> > glass ahead of it and a garage wall to finish.
> >
> > BTB: The 15.5 ultrathin got broken. I suspect a cat
> > named Fats, but no
> > evidence of course and the perpetrator will only
> > answer one historical
> > question. So I swept it up and started to think
> > about the next attempt at
> > ultrathin.
> >
> > David Davis
> > Toledo, OR 97391
> >
> >
> >
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> >
>
>
>
>
>
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>
>
> ------------------------------
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>
> End of ATM Digest, Vol 46, Issue 7
> **********************************
>
regards and clear skies
Román Toledo
Celestron Nexstar GPS 9.25
making a 12.5 and 13" mirrors
_______________________________________________
ATM mailing list http://www.atmlist.net/