I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
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highfnum
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by highfnum » Mon Oct 26, 2020 11:27 pm
picked up old copy(1875) of "Schellen's Spectrum Analysis"
wonderful illustrations
cover : can u guess what it is?
- sncover.jpg (80.25 KiB) Viewed 376 times
random other pages
there is a whole topic of 1868 eclipse
as well as others
- snsolspectrums.jpg (235.17 KiB) Viewed 376 times
- snlrgproms.jpg (183.82 KiB) Viewed 376 times
- snspromsm.jpg (188.06 KiB) Viewed 376 times
- snsuneclips.jpg (184.01 KiB) Viewed 376 times
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highfnum
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by highfnum » Tue Oct 27, 2020 1:43 am
oops 1872 not 1875
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Montana
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by Montana » Tue Oct 27, 2020 2:34 pm
Wow!! what a beauty!
I'm guessing the Sun
Alexandra
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rsfoto
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by rsfoto » Tue Oct 27, 2020 5:41 pm
highfnum wrote: ↑Tue Oct 27, 2020 1:43 am
oops 1872 not 1875
Great, at that book age 3 years difference do not matter
regards Rainer
Observatorio Real de 14 San Luis Potosi Mexico
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highfnum
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by highfnum » Tue Oct 27, 2020 9:44 pm
i am referring to cover image guess again
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Carbon60
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by Carbon60 » Wed Oct 28, 2020 6:49 am
An excellent book. One for a display cabinet.
I believe the cover image is a solar spectroscope by Norman Lockyer. Multiple prisms in a circular arrangement to achieve high dispersion. I only know because the original (or maybe a reproduction) was on display at the Science museum in London a couple of years ago.
https://solarchatforum.com/viewtopic.p ... um#p227191
Stu.
Last edited by
Carbon60 on Wed Oct 28, 2020 7:39 am, edited 1 time in total.
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Montana
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by Montana » Wed Oct 28, 2020 7:04 am
It does look like a drawing of the Sun though
with bits sticking out, but Stuart's idea looks better
Alexandra
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highfnum
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by highfnum » Wed Oct 28, 2020 10:06 am
Stu got it!!
its a prizm train
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highfnum
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by highfnum » Wed Oct 28, 2020 11:12 am
one thing i don't understand
some images show spectroscopes
with even numbers of prizms
how can that work?
disperse combine. - even
disperse combine disperse-- odd
you get what i mean?
it should always end with disperse?
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highfnum
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by highfnum » Wed Oct 28, 2020 11:41 am
great photo Stu
book has that same image
Note; wearing that hat should be a requirement when looking at sun
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Carbon60
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by Carbon60 » Wed Oct 28, 2020 12:59 pm
highfnum wrote: ↑Wed Oct 28, 2020 11:12 am
one thing i don't understand
some images show spectroscopes
with even numbers of prizms
how can that work?
disperse combine. - even
disperse combine disperse-- odd
you get what i mean?
it should always end with disperse?
Hi John,
I think they all disperse; no recombination. This gives an overall gradually increasingly wider degree of dispersion throughout the train.
Stu.
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highfnum
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by highfnum » Wed Oct 28, 2020 1:47 pm
thx stu
FYI that scope was OD 6.5 inch , FL of 96.5 (in book)
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Merlin66
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by Merlin66 » Thu Oct 29, 2020 1:29 am
Whoooo
That's a great and very useful find!
(There's a eCopy available:
https://ia803207.us.archive.org/12/item ... 00sche.pdf )
The dispersion of a prism is directly related to the base length - either a very (very!) large and expensive prism, or the addition of many smaller ones - there is a limit around eight prisms when the light loss becomes unacceptable.
