[EMS Discuss] Solar Foundry

Mark Danburg-Wyld EMAIL HIDDEN
Tue Sep 10 08:51:41 PDT 2013


Keeping the focal point on a plane would be a problem for a harmonograph,
probably.

Bob, I would appreciate a lens. I promise to set something on fire with it,
but in a controlled, contained manner.


On Tue, Sep 10, 2013 at 5:46 AM, John Burridge <EMAIL HIDDEN>wrote:

> 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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