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  #851  
Old 08-21-2017, 02:50 PM
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Default Re: The Make Something Every Week Contest

:unnod:

Not so much "wear" as in "hold in place." Because it's not well balanced and doesn't sit on the head (even one with my circumference).
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  #852  
Old 08-21-2017, 04:01 PM
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Default Re: The Make Something Every Week Contest

Quote:
Originally Posted by BrotherMan View Post
It's just a piece of welding glass (#10, highest I could find) duck taped in a box with a whole (poorly) cut out of it.

But it's mine.
#10 isn't dark enough, #12 or darker is recommended, you risk damaging your eyes if you use that one.
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  #853  
Old 08-21-2017, 04:45 PM
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Default Re: The Make Something Every Week Contest

This article would appear to confirm what thedoc said:
Quote:
Experts suggests that one widely available filter for safe solar viewing is welders glass of sufficiently high number. The only ones that are safe for direct viewing of the Sun with your eyes are those of Shade 12 or higher. These are much darker than the filters used for most kinds of welding. If you have an old welder’s helmet around the house and are thinking of using it to view the Sun, make sure you know the filter’s shade number. If it’s less than 12 (and it probably is), don’t even think about using it to look at the Sun. Many people find the Sun too bright even in a Shade 12 filter, and some find the Sun too dim in a Shade 14 filter — but Shade 13 filters are uncommon and can be hard to find.
We don't want a blind Bort!

Edit: https://www.usatoday.com/story/news/...ely/578679001/

Nasa says only 14 or higher!
Quote:
According to the NASA total eclipse website, a shade 14 welding lens is the only lens adequate for viewing the eclipse.
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  #854  
Old 08-21-2017, 05:20 PM
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Default Re: The Make Something Every Week Contest

WHATEVER. WHATEVER. I DO WHAT I WANT.

:whuteva:

I won't be blinding myself with my bortraption. Honest.
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  #855  
Old 08-21-2017, 05:33 PM
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Default Re: The Make Something Every Week Contest

You could use your contraption along with a dish of water and view the sun's reflection in the water.

Water alone isn't safe for viewing the sun but that along with your contraption should be safe - though perhaps it will be too dim.

Pinhole projector with a piece of white paper for the screen is still the easiest safe way. You can make an optically good pinhole by piercing a bit of cooking foil with a needle.

During totality, put aside any vision protection gadgets. It's safe, and best, to view the corona directly.
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  #856  
Old 08-23-2017, 03:15 AM
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Default Re: The Make Something Every Week Contest

Looking at the shadow of a piece of paper with a hole in it was sufficient for my purposes. We got less than 80% coverage and the effect was more "cloudy day" than "the end of all ends".
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