Modified telescope.

Modified telescope.

This topic has 4 replies, 3 voices, and was last updated 17 March 2019 at 09:17 by Neil Wyatt.

Viewing 5 posts - 1 through 5 (of 5 total)

Author

Posts
16 March 2019 at 17:30 #400687
Maurice Cox 1
Participant
@mauricecox1
Many years ago, I considered grinding my own mirror for an astronomical telescope. I got a lot of books from the library, some of which covered telescopes in general .In of these was a refracting telescope that had a matte black cone positioned at the primary focus, with a base diameter dimensioned to obcsure the sun's disc and just project (or view with suitable filters) the corona. I am unable to find any reference to it now. Does anyone know of such a thing, and how well did it work please?

Regards Maurice
Advert

16 March 2019 at 17:30 #3826
Maurice Cox 1
Participant
@mauricecox1
16 March 2019 at 19:32 #400701
Michael Gilligan
Participant
@michaelgilligan61133
This is only a very small step in the right direction, Maurice:

Try looking for Coronagraph … maybe starting here: **LINK**

https://en.m.wikipedia.org/wiki/Bernard_Lyot

MichaelG.
16 March 2019 at 22:30 #400731
Maurice Cox 1
Participant
@mauricecox1
Thank you Michael, that is exactly what I remember but with far more detail. Really interesting stuff .

Thanks again. Maurice
17 March 2019 at 09:17 #400772
Neil Wyatt
Moderator
@neilwyatt
I'm sure you know, Maurice, but for anyone thinking of a quick experiment a reminder that any solarscope needs a proper solar filter or other device to prevent eye damage – the projection method being eth safets of all (and always cover up your finderscope!)

Neil
Author

Posts

Viewing 5 posts - 1 through 5 (of 5 total)

Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

Code of Conduct

Latest Replies

Viewing 25 topics - 1 through 25 (of 25 total)

- Topic
- Voices
- Posts
- Last Post
- Recommendations for book on clock repairs
  Started by: Andy Stopford in: Clocks and Scientific Instruments
- 4
- 4
- 24 August 2025 at 21:40
  Brian Merrifield
- Quartz clock movement
  Started by: duncan webster 1 in: Electronics in the Workshop
- 2
- 3
- 24 August 2025 at 21:37
  duncan webster 1
- Lathe tool inserts
  Started by: Andy Brocklehurst in: Beginners questions
- 2
- 2
- 24 August 2025 at 21:32
  Diogenes
- Bending copper tube?
  Started by: Bo’sun in: Workshop Techniques
- 6
- 6
- 24 August 2025 at 21:31
  Michael Gilligan
- Milling for beginners book, Where?
  Started by: andy198712 in: Beginners questions
- 8
- 13
- 24 August 2025 at 21:10
  andy198712
- THE MAUDSLAY TABELE ENGINE
  Started by: sivtek1 in: Stationary engines
- 4
- 7
- 24 August 2025 at 20:27
  Michael Gilligan
- Progress no.1 restoration
  Started by: flyingsailor in: Workshop Tools and Tooling
- 9
- 12
- 24 August 2025 at 19:52
  duncan webster 1
- A4 stainless
  Started by: David Ambrose in: Materials
- 14
- 22
- 24 August 2025 at 19:15
  old mart
- Blackgates 3 Way Toolpost Casting
  Started by: John McCulla in: Materials
- 13
- 23
- 24 August 2025 at 19:00
  duncan webster 1
- Softening epoxy 1 2
  Started by: John Haine in: General Questions
- 18
- 26
- 24 August 2025 at 18:59
  old mart
- Joined 24 August 2025
  Started by: simon912 in: Introduce Yourself – New members start here!
- 3
- 3
- 24 August 2025 at 18:59
  noel shelley
- The stand alone weight for tower clock 1 2
  Started by: dk0 in: Clocks and Scientific Instruments
- 12
- 38
- 24 August 2025 at 18:33
  bernard towers
- Denford Orac refit
  Started by: Richard Evans 2 in: CNC machines, Home builds, Conversions, ELS, automation, software, etc tools
- 3
- 5
- 24 August 2025 at 16:59
  Richard Evans 2
- Manual for Warco GH750 or Chester Cub 630
  Started by: Gavlar in: General Questions
- 7
- 17
- 24 August 2025 at 16:03
  Gavlar
- THE MAUDSLAY TABELE ENGINE
  Started by: sivtek1 in: Introduce Yourself – New members start here!
- 2
- 3
- 24 August 2025 at 11:57
  sivtek1
- CNC Coolant 1 2 3
  Started by: Steve355 in: CNC machines, Home builds, Conversions, ELS, automation, software, etc tools
- 13
- 53
- 24 August 2025 at 11:37
  Steve355
- Phone Phreaking
  Started by: Michael Gilligan in: Clocks and Scientific Instruments
- 11
- 14
- 24 August 2025 at 11:35
  John Haine
- QCTP for chester lathe 1 2
  Started by: Chris12 in: Beginners questions
- 11
- 26
- 24 August 2025 at 11:11
  dk0
- Material advice
  Started by: tobyonekenobi in: Materials
- 10
- 21
- 24 August 2025 at 10:57
  tobyonekenobi
- Model Aircraft Engine
  Started by: Alan Charleston in: Suggested Online Resources
- 2
- 2
- 24 August 2025 at 09:38
  Michael Gilligan
- Smart & Brown Model L lathe help required
  Started by: AJAX in: Manual machine tools
- 1
- 4
- 23 August 2025 at 21:45
  AJAX
- This weeks oddity!
  Started by: Martin King 2 in: Help and Assistance! (Offered or Wanted)
- 4
- 5
- 23 August 2025 at 17:29
  Martin King 2
- Asong power feed?
  Started by: Hollowpoint in: General Questions
- 5
- 6
- 23 August 2025 at 16:55
  Stuart Smith 5
- New member, progress no.1 rest
  Started by: flyingsailor in: Introduce Yourself – New members start here!
- 5
- 7
- 23 August 2025 at 16:11
  flyingsailor
- My week this week! My workshop videos 1 2 … 11 12
  Started by: Phil Whitley in: The Tea Room
- 16
- 297
- 23 August 2025 at 16:05
  Phil Whitley

Viewing 25 topics - 1 through 25 (of 25 total)

View full reply list.

Latest Issue

September 2025

Buy Latest/Back Issues

Newsletter Sign-up

Latest Replies