On Sep 8, 5:59*pm, John Smith wrote:
Art Unwin wrote:
Centuries past there was a cold spell on Earth where it is stated
radiation propagation did not occur because of the lack of sun spot
observations. This period lasted about 30 years if my memory is
correct. ...
Art KB9MZ...xg

With "radio" being discovered in 1895 by Tesla:

http://www.pbs.org/tesla/ll/ll_whoradio.html

how many "centuries" are you talking about?; *and, can you provide a
lead to this data you are referencing?

Regards,
JS

--
It is like a nightmare where the public servants are the people which
the police are supposed to protect us from!

I do believe it was in the early 1800s because the River Thames froze
in London such that they were able to
have a fair on the ice.Remember the river is tidal ! I seem to
remember that there were no sunspots observed for some thirty years!
Not a good time for radio if it happens again. I will research for the
actual facts and get back to the forum
Regards
Art Unwin KB9MZ.......xg