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Old August 22nd 17, 07:44 AM posted to uk.tech.digital-tv
Scott[_2_]
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Default Watching an eclipse

On Mon, 21 Aug 2017 22:24:13 +0100, Andy Burns
wrote:

Huge wrote:

I've watched two through (arc) welding filters.


Quite a chunk of the ISO/BS standard is lifted from section 4.1 of this
NASA document

https://eclipses.gsfc.nasa.gov/SEpubs/2010/TP214171a.pdf

exposed B&W film provided you know it's a silver-based film


I was going to ask if such safe methods existed in the 1960s then I
realised there was probably more welding (in the UK) and more
monochorme film in these days :-)