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User talk:DOwenWilliams

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Hi David - I left a reply on Talk:Focus-balanced paraboloid. Welcome. --Chriswaterguy 01:24, 5 July 2010 (UTC)


Welcome![edit]

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Hi DOwenWilliams,

Welcome to the Appropedia wiki. Please make yourself at home! If you need a general wiki-tutorial, see the main help page (or the more in-depth one on WikiEducator).

Check your preferences and be sure you verify your email address and turn on email notification if you'd like it -- you can find out when your talk page, or any page on your watchlist, is modified. You may want to upload a photo or information about yourself to your userpage (which is at http://appropedia.org/User:DOwenWilliams).

If you have a particular interest or project in mind, go ahead and start it! If you have questions or suggestions, the best place to leave them is at our community discussion page, which we call the Village pump - you should get a fast response. Or, feel free to leave me a note on my talk page if you have further questions, need help finding your way around, have a cool idea for a project, or just want to chat.

Glad to have you here!

-Chriswaterguy

Smart windows, etc.[edit]

Answered at User talk:Chriswaterguy #Smart windows, etc. - redirect created. Thanks. --Chriswaterguy 06:11, 28 March 2011 (PDT)

Images[edit]

Answered at User talk:Chriswaterguy #Heliostats image - thanks --Chriswaterguy 11:46, 12 June 2011 (PDT)

I saw your question at User talk:Chriswaterguy #Heliostats image; image was mine; you can find the 3D model via Google warehouse (type in "heliostat" or AT CAD Team") KVDP 01:47, 16 June 2011 (PDT)

I figured out, I think, that the image shows a heliostat (with a curious blue mirror) that is supposed to be operated by hand. But my immediate reaction was to ask "Why bother?". Thousands of years ago, the Egyptians used manually-moved mirrors for daylighting without constructing any kind of heliostat mechanism. Somebody, probably a servant, just kept an eye on the beam of reflected light, and when necessary adjusted the orientation of the mirror. The mirror was just propped against a rock, or something of the sort. (I've seen this being done in Egypt fairly recently. I was told that they were reproducing what the ancients did, and I have no reason to disbelieve them.) So what is "Appropriate Technology" about the thing you showed, when a simple rock is all that is needed?
Much more AT, in my opinion, are the clockwork devices that are used for solar cooking in India and other places in the developing world. A clockwork mechanism rotates a mirror about a polar-aligned axis at 15 degrees per hour to compensate for the movement of the sun in the sky. But I haven't found any nice public-domain images of any of them.
DOwenWilliams 20:15, 16 June 2011 (PDT) David Williams
No, you are misinterpreting the device. horizontal and vertical axis are motor-driven, and have a electronics system to change both alignments, allowing to track the sun without any human input.

KVDP 01:31, 18 June 2011 (PDT)

Ok. So it's just another heliostat driven by motors and electronics. So what's "AT" about it? Especially, what's AT about the image? The clockwork devices are much simpler. DOwenWilliams 07:44, 18 June 2011 (PDT) David Williams