Solar observation techniques | XIX century
Two articles on solar observation techniques
Re', P. (2021). William Herschel's Solar Observation Techniques
http://pedroreastrophotography.com/Will ... 25_PRE.pdf
Re', P. (2020). History of solar observation.
http://pedroreastrophotography.com/Hist ... 201113.pdf
Solar observation techniques | XIX century
- pedro
- Way More Fun to Share It!!
- Posts: 12256
- Joined: Sun May 01, 2016 8:26 pm
- Location: Portugal
- Has thanked: 14 times
- Been thanked: 6573 times
- Contact:
-
- Way More Fun to Share It!!
- Posts: 2150
- Joined: Sun Jun 14, 2015 4:46 pm
- Location: France
- Has thanked: 1 time
- Been thanked: 2712 times
- Contact:
Re: Solar observation techniques | XIX century
Excellent Pedro !!
The experiments made by W. Herschell are a bit frightening. There was no ISO norm back then ;-)
The experiments made by W. Herschell are a bit frightening. There was no ISO norm back then ;-)
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
- pedro
- Way More Fun to Share It!!
- Posts: 12256
- Joined: Sun May 01, 2016 8:26 pm
- Location: Portugal
- Has thanked: 14 times
- Been thanked: 6573 times
- Contact:
Re: Solar observation techniques | XIX century
Thanks Christian
Very frightening indeed.
(...)
In 1801, Herschel viewed the sun through a mixture of ink diluted with water and filtered through paper. It gave an image of the sun ' as white as snow '. An eyepiece was then filled with a solution of ferrous sulphate with ' tincture of galls '. This gave a dark blue solar image which changed, on adding more ferrous sulphate to the solution, to an image 'of a deep red colour.'
It's also very interesting to read John Herschel description of his Helioscope, that was never built
(...)
The first Helioscope was described by John Herschel in his book The Telescope. This solar telescope was never built.
The Helioscope – There is yet another species of reflecting telescope to be noticed, the specula of which are made of unsilvered glass, employing only the portions of light reflected at their surfaces. The object of this construction (first proposed by the author of this article in 1847 – Results of Astron. Obs. At the Cape of Hope, P. 436) is to obviate the necessity of employing darkening glasses in viewing the Sun with telescopes of great power, which break by the heat and endanger the eye, besides other inconveniences (...)
Very frightening indeed.
(...)
In 1801, Herschel viewed the sun through a mixture of ink diluted with water and filtered through paper. It gave an image of the sun ' as white as snow '. An eyepiece was then filled with a solution of ferrous sulphate with ' tincture of galls '. This gave a dark blue solar image which changed, on adding more ferrous sulphate to the solution, to an image 'of a deep red colour.'
It's also very interesting to read John Herschel description of his Helioscope, that was never built
(...)
The first Helioscope was described by John Herschel in his book The Telescope. This solar telescope was never built.
The Helioscope – There is yet another species of reflecting telescope to be noticed, the specula of which are made of unsilvered glass, employing only the portions of light reflected at their surfaces. The object of this construction (first proposed by the author of this article in 1847 – Results of Astron. Obs. At the Cape of Hope, P. 436) is to obviate the necessity of employing darkening glasses in viewing the Sun with telescopes of great power, which break by the heat and endanger the eye, besides other inconveniences (...)
Pedro Re'
https://pedroreastrophotography.com/
https://pedroreastrophotography.com/
- Carbon60
- Way More Fun to Share It!!
- Posts: 14204
- Joined: Wed Mar 07, 2012 12:33 pm
- Location: Lancashire, UK
- Has thanked: 8415 times
- Been thanked: 8161 times
Re: Solar observation techniques | XIX century
Don’t you just love the historical roots of solar observation, and astronomy in general.
Thanks for sharing, Pedro.
Stu.
Thanks for sharing, Pedro.
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
-
- Way More Fun to Share It!!
- Posts: 6871
- Joined: Mon May 18, 2020 4:45 pm
- Location: Essex, S.E.England
- Been thanked: 4900 times
Re: Solar observation techniques | XIX century
Very interesting Pedro and thanks vm for the post
Regards
Terry
Regards
Terry
- DeepSolar64
- Way More Fun to Share It!!
- Posts: 18823
- Joined: Thu Sep 05, 2019 12:19 am
- Location: Lowndesville S.C.
- Has thanked: 17572 times
- Been thanked: 16689 times
Re: Solar observation techniques | XIX century
Pedro,
We walk in the footsteps of giants my friend. Those who paved the way often with considerable risk, like Herschel with his experimental filters. We must remember that he just could not go out and order one from somewhere as we do. He had to learn the nature of sunlight at great risk to find a material, combination of materials or medium that would work. And then there is the diligence of Carrington visually sketching a projected image and discovering what may have been the largest solar flares then and since. Then there is the concept of the helioscope of John Herschel, the solar eyepiece and the Solar ( Herschel ) wedge that now bears his name. We should remember our solar pioneers. Both amateur and professional owe them thanks and walk in their shadow.
Thanks for posting these.
James
We walk in the footsteps of giants my friend. Those who paved the way often with considerable risk, like Herschel with his experimental filters. We must remember that he just could not go out and order one from somewhere as we do. He had to learn the nature of sunlight at great risk to find a material, combination of materials or medium that would work. And then there is the diligence of Carrington visually sketching a projected image and discovering what may have been the largest solar flares then and since. Then there is the concept of the helioscope of John Herschel, the solar eyepiece and the Solar ( Herschel ) wedge that now bears his name. We should remember our solar pioneers. Both amateur and professional owe them thanks and walk in their shadow.
Thanks for posting these.
James
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
- pedro
- Way More Fun to Share It!!
- Posts: 12256
- Joined: Sun May 01, 2016 8:26 pm
- Location: Portugal
- Has thanked: 14 times
- Been thanked: 6573 times
- Contact:
Re: Solar observation techniques | XIX century
Thanks a lot guys, appreciate your kind comments.
Pedro Re'
https://pedroreastrophotography.com/
https://pedroreastrophotography.com/