Science
Learning to build (with straw) and power (with solar) a home by DVD

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Katherine Salant / Washington Post on building a “green home” with a new DVD series – “If you will sit for several hours to read a book about home building, will you sit for several hours to watch a book-length DVD on the subject? After watching “Building With Awareness” and “Green Building,” two recent DVDs, I would say yes. I predict that DVDs will make an important contribution to the education of both home builders and homeowners because so many aspects of building can be confusing when reduced to words but straightforward when you can see them.” Thanks Tim! – Link.

Related:
Building With Awareness – Link.

4 thoughts on “Learning to build (with straw) and power (with solar) a home by DVD

  1. i plead ignorance here as i’m out of my league when it comes to ferrofluid, BUT if this is contains magnetic particles, could this be used in a ‘farraday-flashlight’ type device?

    just curious

  2. A long time ago, I ran a speaker company. We were having trouble with tweeters burning out (it was a result of the crossover design, but that’s another story). At that time, the first commercial ferrofluids wer coming on the market. We bought a liter of the stuff and a specialized syringe so that we could inject the ferrofluid into the gap between the pole piece and the magnet. The magnetic field held the ferrofluid in place so that it could transfer heat from the fragile tweeter voice coil. I treated quite a few tweeters.

    One night our factory (in East Boston) was broken into and the thieves knocked the ferrofluid bottle to the floor. I nearly cried when I saw our $1000 investment ($700 for the ferrofluid!) making a stain on the old wooden floor.

  3. if this is contains magnetic particles, could this be used in a ‘farraday-flashlight’ type device?

    The Faraday Flashlight is a simple generator. You shake it to move a coil of wire and a magnet relative to each other. This generates electricity which is used to charge a capacitor which, in turn, is used to light an LED.

    Think of ferrofluid as iron filings in liquid form. Since it acts as neither a magnet nor a coil of wire it would not be of any obvious use in making a Faraday Flashlight device.

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