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gaiatechnician
Joined: 06 Jan 2008
Posts: 32
Location: Victoria BC
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 Posted: Sun Nov 09, 2008 10:00 pm Post subject: combining 2 parabolic troughs to produce a point of light |
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http://www.youtube.com/watch?v=Td_c8fIiu4M
and http://www.youtube.com/watch?v=FYzgYI9_h6s
show it and the man has lots of links starting from his youtube site.
http://www.youtube.com/user/MathRehab
The advantage is that you can get the same effect as a parabolic dish without bending in 2 directions. So all you need is sheet material. anyone who has made a parabolic dish knows how much the reflective material wrinkles when you make the dish. This would be almost eliminated if you are only bending in one direction.
I am very surprised that I have never seen this technique before. I think it will prove very useful once people start trying it.
It might work for shining the light up under upside down box cookers, and it might also be adaptable enough so that with some modifications people can make the "compound parabolic effect" (a larger area of light which stays on the one area much longer).
Anyway, take a look and comment.
Also, how about rating the guy's video? I think what he has done is brilliantly simple and he has made big efforts to share his ideas.
Brian |
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webmaster
Site Admin
Joined: 25 Oct 2006
Posts: 66
Location: Seattle, Washington
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| Posted: Thu Nov 13, 2008 6:55 am Post subject: Can you add this information to the Wiki? |
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This looks like a valuable addition to our knowledge. Please add it if you can.
Thanks,
Tom |
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gaiatechnician
Joined: 06 Jan 2008
Posts: 32
Location: Victoria BC
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| Posted: Sat Nov 15, 2008 5:58 am Post subject: Re: Can you add this information to the Wiki? |
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Hi, Tom, I have not done it myself and I have only basic understanding of it. I think the guy would be happy to add it (or to let you add it) if you contact him.
He has some pretty neat text and picture explanations
thanks Brian
| webmaster wrote: | This looks like a valuable addition to our knowledge. Please add it if you can.
Thanks,
Tom |
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Brit from Norway
Joined: 27 Dec 2006
Posts: 17
Location: Norway
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| Posted: Wed Mar 04, 2009 11:04 pm Post subject: |
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Hi Brian!
I watched the videoes and read the background information, and am impressed like you. This is really something I would like to try, but like you I am not sure that I understand it fully.
I know how to construct parabolas though. I will definitely read it all again, and when I have summer vacation, I will try some cooking.
Thank you for giving us this information which in my opinion is quite revolutonary!
Regards
Brit from Norway
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Best wishes to you all! Keep up the good work! |
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