[EMS Discuss] Solar Foundry

Mark Danburg-Wyld danburgwyld at gmail.com
Sun Feb 16 09:26:06 PST 2014


Not *quite* clear skies this morning, but enough to figure out that I need
a way to make the height of the platform adjustable if this is going to
fly. Probably an old car jack could be modified to work, anyone got a
better suggestion?
On Feb 4, 2014 8:18 PM, "Mark Danburg-Wyld" <danburgwyld at gmail.com> wrote:

> Went back to Craigslist, got another screen. This time I think I hit the
> jackpot. The fresnel lens has clearly circular grooves, indicating that it
> is a spot lens instead of a linear lens. And it's huge: 56" x 32". More as
> it develops...
>
>
> On Sat, Feb 1, 2014 at 3:37 PM, Mark Danburg-Wyld <danburgwyld at gmail.com>wrote:
>
>> Sad news, I can confirm that the frosting is having some impact. I can
>> get a lot hotter spot off the clear 11" square than from the much larger
>> but not clear lens. Bob, I will take you up on the offer of the Novus #2,
>> see if that helps. Worst case, well, back to the shopping around for a
>> better lens...
>>  On Feb 1, 2014 12:37 PM, "Darrell Perko" <dperko at efn.org> wrote:
>>
>>>
>>> Ask, and ye shall receive!
>>>
>>> On 2/1/2014 10:20 AM, Mark Danburg-Wyld wrote:
>>>
>>> Now all I need is some unfiltered sunlight...
>>> On Jan 25, 2014 11:37 PM, "Scott" <sceptic4life at gmail.com> wrote:
>>>
>>>> > The frosting might not affect infra red as much as visible range.
>>>>
>>>> > Sent from my iPhone
>>>>
>>>> On Jan 25, 2014, at 10:20 AM, Bob Miller <kbob at jogger-egg.com> wrote:
>>>>
>>>> > A 52" irregular plastic box?  We can hold a puppet show!
>>>> >
>>>> > If the frosting is on the opposite side from the Fresnel grating, you
>>>> might be able to buff out the frosting with Novus #2 polish.  I have a
>>>> bottle if you want to try.  If you know what kind of plastic it is, you can
>>>> also clean it and wet it with [solvent] to melt and re-flow the surface.
>>>>  The second approach is easier but more likely to destroy the lens if it
>>>> doesn't work.
>>>> >
>>>> > Also, be sure to try passing light through in both dimensions.  The
>>>> interaction of the grating with the frosting may work differently in one
>>>> direction than the other.
>>>> >
>>>> >
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>>>
>>>
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