[EMS Discuss] Solar Foundry

Mark Danburg-Wyld danburgwyld at gmail.com
Tue Feb 4 20:18:48 PST 2014


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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