They talk about this like it is something new. Hippies were
doing this in the 60's. Glass prism versions were used on
sailing ships 200 years ago.
http://en.wikipedia.org/wiki/Deck_prism

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of alan.b.pearce@stfc.ac.uk
> Sent: Tuesday, August 13, 2013 7:16 AM
> To: piclist@mit.edu
> Subject: [EE] The non-electric lamp ...
>=20
> Trouble is it only works during the day ...
>=20
> http://www.bbc.co.uk/news/magazine-23536914
>=20
> I don't think Russell needs to worry about his torches
going
> out of fashion ...
>=20
>=20
>=20
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