[EMS Discuss] Solar Foundry

John Burridge EMAIL HIDDEN
Tue Sep 10 05:46:38 PDT 2013


Hmmm.  Sand tray + fresnel lens + two pipes on universal joints =
solar harmonograph.

On Tue, Sep 10, 2013 at 2:25 AM, Bob Miller <EMAIL HIDDEN> wrote:
> Solar food cookers generally work in cloudy conditions.  They are not
> as hot, obviously.  If I recall, they take about twice as long to cook
> on a cloudy day.
>
> The foundry has a very small working volume so it requires a
> concentrated light source.
>
> In other news, I found my fresnel lens.  I actually have two of them,
> but they are small.  11 inches square.  They are still available to
> anyone who is actually going to build one of these.
>
>
>
> On Sun, Sep 8, 2013 at 8:01 PM, Weston Turner <EMAIL HIDDEN> wrote:
>> Do you think that even in the winter months it might produce enough heat to
>> use it as a solar oven? If you could cook with it even in overcast whether,
>> it would be a cool demonstration of how much solar energy makes it through
>> the clouds even in the rainy season.
>>
>> Just a thought as to what it might be useful for the other 8-9 months of the
>> year.
>>
>> Weston
>>
>> On Sep 8, 2013, at 7:51 PM, Sam Foster <EMAIL HIDDEN> wrote:
>>
>> Oh I've seen this video. We need a large fresnel lens - they come from large
>> old rear projection tvs. In other words with some judicious scavenging, the
>> whole build shouldn't cost more than a bit of lumber and fixings.
>>
>> On 9/8/2013 7:27 PM, Mark Danburg-Wyld wrote:
>>
>> Step 1: Watch this video: http://www.youtube.com/watch?v=drE54ctrHBY
>> Step B: Let me know if you'd be interested in building a solar foundry for
>> EMS
>> ???
>> Step 4: Profit!
>>
>>
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>
>
>
> --
> Bob Miller                              K<bob>
>                                         EMAIL HIDDEN
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John Burridge
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http://johnburridge.blogspot.com


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