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| Hi David - I left a reply on [[Talk:Focus-balanced paraboloid]]. Welcome. --[[User:Chriswaterguy|Chriswaterguy]] 01:24, 5 July 2010 (UTC)
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| == Smart windows, etc. ==
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| Answered at [[User talk:Chriswaterguy #Smart windows, etc.]] - redirect created. Thanks. --[[User:Chriswaterguy|Chriswaterguy]] 06:11, 28 March 2011 (PDT)
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| == Images ==
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| Answered at [[User talk:Chriswaterguy #Heliostats image]] - thanks --[[User:Chriswaterguy|Chriswaterguy]] 11:46, 12 June 2011 (PDT)
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| I saw your question at [[User talk:Chriswaterguy #Heliostats image]];
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| image was mine; you can find the 3D model via Google warehouse (type in "heliostat" or AT CAD Team")
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| [[User:KVDP|KVDP]] 01:47, 16 June 2011 (PDT)
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| :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?
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| :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.
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| :[[User:DOwenWilliams|DOwenWilliams]] 20:15, 16 June 2011 (PDT) David Williams | |
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| ::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.
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| [[User:KVDP|KVDP]] 01:31, 18 June 2011 (PDT)
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| :::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. [[User:DOwenWilliams|DOwenWilliams]] 07:44, 18 June 2011 (PDT) David Williams
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