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Name that scope

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#1 Ed Jones

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Posted 10 January 2019 - 07:09 PM

What is the name of the historical refractor (at Harvard maybe?) that used an optical flat and brought the image indoors for viewing?  I can't seem to find anything on it on Google.  



#2 Richard O'Neill

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Posted 10 January 2019 - 07:28 PM

 If no answer appears here I'd post the question to the Antique Telescope Society. More than likely someone there will be able to assist you. 

 

https://ats-forum.gr....io/g/ATS-Forum



#3 clamchip

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Posted 10 January 2019 - 07:43 PM

I know the one your thinking of but I can't place it.

Here's one built by Oscar Knab, a 6 inch f/18. Sky & Telescope July 1970 article:

https://archive.org/...07-pdf/page/n45

 

Robert


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#4 Stellar1

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Posted 10 January 2019 - 07:55 PM

Was it "The Great Refractor" from Harvard College Observatory?



#5 mashirts

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Posted 10 January 2019 - 08:57 PM

http://adsbit.harvar...IEW&classic=YES

#6 Ed Jones

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Posted 10 January 2019 - 09:04 PM

 

Was it "The Great Refractor" from Harvard College Observatory?

No and it might nothave been Harvard.



#7 Ed Jones

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Posted 10 January 2019 - 09:16 PM

OK I found it, it was Harvard.  Gerrish Polar Telescope, Harvard Observatory

 

Attached Thumbnails

  • Gerrish.jpg

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#8 Chuck Hards

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Posted 10 January 2019 - 09:37 PM

The late Oscar Knab build a really cool Gerrish mounted refractor.  There have been a few of them.  I'd like to make a Gerrish for a 6" f/10 Jaegers lens I have.  

 

I remember another one in S&T from long ago, a 60mm refractor on a portable arrangement, might have had wheels.  



#9 bremms

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Posted 10 January 2019 - 09:45 PM

If iit was gold plated and rhinestone studded it would be a garish Gerrish.


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#10 Ed Jones

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Posted 11 January 2019 - 04:07 PM

My banjo is gold  plated, are you calling it garish?    banjodance.gif  


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#11 Chuck Hards

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Posted 11 January 2019 - 09:38 PM

My baño is gold-plated, but after all, it is my throne.  

 

 

 

Rim_Shot.gif


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#12 bremms

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Posted 11 January 2019 - 11:12 PM

My banjo is gold  plated, are you calling it garish?    banjodance.gif  

Well.... lol.gif lol.gif  



#13 tim53

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Posted 11 January 2019 - 11:34 PM

OK I found it, it was Harvard.  Gerrish Polar Telescope, Harvard Observatory

That's always been one of my favorite telescopes, as is Oscar Knab's version.  I've cogitated about making one out of my 6" f/15 Jaegers that I built here:  https://www.cloudyni...-this-weekend/#

 

Because except for the time building it, and the one trip to Pinos with it, I haven't used it at all.

 

-Tim.


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#14 clamchip

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Posted 12 January 2019 - 11:23 AM

Tim your lens looks suspiciously like a Edmund.

I've never seen a 6 inch Edmund, it was available for only a short time.

Your edge markings look Edmund, printed arrows with a number beside 

the arrow, arrow's point at each other.

I've never seen a Jaegers lens printed in this manner, only hand penciled

markings. 

If it is Edmund it will probably be Fraunhofer and the lens spacing should

be around .005", it can be confirmed with DPAC.

Here's a Edmund 4 inch, the 3's and 5's are marked the same way:

Robert 

 

post-50896-0-84677600-1421002412_thumb.jpg


Edited by clamchip, 12 January 2019 - 11:25 AM.

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#15 tim53

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Posted 12 January 2019 - 12:13 PM

Hi Robert:

 

That's certainly a possibility.  I got it with the machined cell, but no documentation.  .005" is pretty thick, I don't know if I ever measured the spacers, but I did use the ones that came with it.



#16 Ed Jones

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Posted 13 January 2019 - 01:45 PM

I'm thinking of using a small refractor in a polar scope even though I already have a window scope.  Something quick and easy might be fun to do and use.  The nice thing with a polar scope is that it's indoors and the position angle reads directly.  I just need to think of the simplest way to read out Declination.




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