Re: ATM Ritchey-Chretien

[Rodger Petersen <faintfuzzy@worldnet.att.net>]

Steve Lee wrote:
> 
> > Steven Lee:  I think you mean James Gregory, who lived in seventeenth
> > century England. If John Gregory is lurking somewhere on the web,  he
> > probably found that attribution amusing, but as far as I know he is still
> > living in Dripping Springs, Texas. John Gregory's design that you may be
> > thinking about is the Gregory-Maksutov.
> 
> > On the origin of the Dall-Kirkham design, I don't have my resources at hand
> > at the moment, but I think Albert G. Ingalls is probably the source of this
> > name. Kirkham was an ATM, in Oregon if my memory serves me, and was an
> > active correspondent of Ingalls and a member, for a while, of Ingall's inner
> > circle of correspondents. Ingalls looked into the question of priority and
> > concluded that Dall, and Kirkham both deserved credit, and tagged the design
> > with the name that has stuck since that time. If anyone is interested, I can
> > probably give you the citation for the article on the subject in Scientific
> > American.
> 
> Tom,
> 
> I can't believe that I wrote what I wrote!  My excuse is that it was 4:30
> in the morning and I must have still been asleep.  My brain (?) clearly
> got side-tracked on the Gregory-Maksutov which I was going to throw in
> as another example and I jumped names and then wandered off.  If you
> substitute Allan Kirkham for John Gregory then at least some of the story
> makes sense.  I believe that you are correct in that Ingalls put the
> two together, but in my mind it should always be the Dall-Cassegrain.
> What I should have said is..
> 
> Horace Dall invented the D-K all by himself.  Allan Kirkham got into the
> act by explaining what Horace had done in mathematical terms after it had
> been built.
> 
> And then I was going to throw in about the Gregory-Maksutov being yet
> another example of double-barrel names, and then point out that in
> Holland the Maksutov is called a Bowers and some refer to it as a
> Bowers-Maksutov.  It was certainly a mixture of priority and national
> pride which confuses this design.
> 
> James Gregory, inventor of the Gregorian, was a Scottish mathematician.
> My (Scottish) wife would never allow me to let him be called English.
> 
> > As for the pronunciation of Chretien - it depends upon which side
> > of the Atlantic you reside.
> 
> And to all of you who spotted the fact that Australia doesn't bound the
> Atlantic at all and so want to know which side of the Atlantic I reside,
> the answer is - the correct side, i.e. nowhere near it at all!
> 
> I have always pronounced it KRET-ee-en but have never know whether it was
> correct - hence I didn't want to put my foot in it (which I now have).
> 
> Steven Lee
> URL:        http://www.aao.gov.au/local/www/sl/
> e-mail      SL@aaocbn.aao.gov.auThe designs that have been mentioned sound wonderful, 
>for us one mirror 
veterans , I saw a Houghton at Table Mountain Star Party. It took a 
prize for ...everthing I think. All surfaces are spherical !! This 
particular scope was a very finely crafted piece of work, and M31 looked 
great through it. Bill cook has all the stuff on it. Nice scope, easy 
surfaces to creat
Rodg