Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

John Dobson Solar Scope?

  • Please log in to reply
5 replies to this topic

#1 KI5CAW

KI5CAW

    Ranger 4

  • -----
  • topic starter
  • Posts: 354
  • Joined: 07 Nov 2019
  • Loc: East Mountains, New Mexico

Posted 27 March 2023 - 08:21 PM

Many years ago I happened upon Dobson and his buddies showing off the Sun's disk and spots, using a telescope of Dobson's design that had a diagonal that consisted of a full diameter flat at 45 degrees to the optical path. The flat and primary were uncoated and hence passed most of the light. One side served as the diagonal....anybody out there remember this design? I can't find pictures of it anywhere.


  • JamesMStephens, mikemarotta and LU1AR like this

#2 SomeDoSomeDont

SomeDoSomeDont

    Mariner 2

  • *****
  • Posts: 274
  • Joined: 17 Jan 2010
  • Loc: 48096

Posted 27 March 2023 - 08:43 PM

I remember his solar telescope.  I think I have pics on another drive.

Is it your plan to build one?  I have a 6 inch f10 uncoated mirror that I'm willing to sell somewhere stored.

   Andy


Edited by SomeDoSomeDont, 27 March 2023 - 08:47 PM.

  • LU1AR likes this

#3 Lazaroff

Lazaroff

    Viking 1

  • *****
  • Posts: 751
  • Joined: 11 Oct 2017

Posted 27 March 2023 - 08:45 PM

I remember it. Here's a link to an article with a photo. The diagonal window may have been coated.

 

https://www.nytimes....stargazing.html


  • mikemarotta and LU1AR like this

#4 hamishbarker

hamishbarker

    Surveyor 1

  • -----
  • Posts: 1,516
  • Joined: 26 Apr 2017

Posted 28 March 2023 - 04:25 AM

diagram for the intrinsically safe solar dobsonian.

 

https://www.sidewalk...erfiles/sun.pdf

 

here's mine alongside a commercial cardboard safe solar projector/viewer

IMG 20191111 181327

  • PrestonE, SomeDoSomeDont, Cap'n Mechanical and 2 others like this

#5 KI5CAW

KI5CAW

    Ranger 4

  • -----
  • topic starter
  • Posts: 354
  • Joined: 07 Nov 2019
  • Loc: East Mountains, New Mexico

Posted 28 March 2023 - 05:15 PM

Thanks everybody, that's exactly the design I remembered. I have no plans to build one but was still curious. Another design I have seen used an unaluminized primary and a Herschel wedge as the secondary. My current solar observing is using a Baader aluminized Mylar filter. It's gotten dusty but I'm afraid to clean itlol.gif


  • LU1AR likes this

#6 SteveInNZ

SteveInNZ

    Apollo

  • *****
  • Posts: 1,135
  • Joined: 07 Oct 2007
  • Loc: Auckland, New Zealand

Posted 28 March 2023 - 06:56 PM

When we visited the Smithsonian in 2017, there was an observatory outside. I don't know if that's a permanent thing or not. At the back, out of the way, was a Dobson solar scope. When I asked if that was what it was, the guide got all excited that I recognized it and then went on to relive her first eclipse experience.

I think it's pretty cool that his scope is (almost) under the same roof as the Wright Flyer, etc.

 

Steve.


  • Toups, SomeDoSomeDont, hamishbarker and 2 others like this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics