New book - 'Building a Better World in Your Backyard' - on Kickstarter (sponsored friend)
Smart windows, etc.
- 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