my new old spectroscopy book

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highfnum
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my new old spectroscopy book

Post 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
sncover.jpg (80.25 KiB) Viewed 360 times
random other pages
there is a whole topic of 1868 eclipse
as well as others
snsolspectrums.jpg
snsolspectrums.jpg (235.17 KiB) Viewed 360 times
snlrgproms.jpg
snlrgproms.jpg (183.82 KiB) Viewed 360 times
snspromsm.jpg
snspromsm.jpg (188.06 KiB) Viewed 360 times
snsuneclips.jpg
snsuneclips.jpg (184.01 KiB) Viewed 360 times



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Re: my new old spectroscopy book

Post by highfnum » Tue Oct 27, 2020 1:43 am

oops 1872 not 1875



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Re: my new old spectroscopy book

Post by Montana » Tue Oct 27, 2020 2:34 pm

Wow!! what a beauty!

I'm guessing the Sun :)

Alexandra



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Re: my new old spectroscopy book

Post 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 :lol:


regards Rainer

Observatorio Real de 14 San Luis Potosi Mexico

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Re: my new old spectroscopy book

Post by highfnum » Tue Oct 27, 2020 9:44 pm

i am referring to cover image guess again



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Re: my new old spectroscopy book

Post 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

Image

Stu.
Last edited by Carbon60 on Wed Oct 28, 2020 7:39 am, edited 1 time in total.


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/

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Re: my new old spectroscopy book

Post 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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Re: my new old spectroscopy book

Post by highfnum » Wed Oct 28, 2020 10:06 am

Stu got it!!
its a prizm train



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Re: my new old spectroscopy book

Post 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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Re: my new old spectroscopy book

Post 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 :lol:
locspectro.jpg
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Re: my new old spectroscopy book

Post 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.


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/

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Re: my new old spectroscopy book

Post 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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Re: my new old spectroscopy book

Post 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.


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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