[GreenKeys] Copper Wire?

[Brooke Clarke]

Hi:

While researching electro-magnets and reading the 1831 papers of Joshph Henry 
I've learned that the horseshoe electro-magnets he made used copper wire (1/40 
to 1/20" dia) that he insulated with Silk.  Later he changed to cotton that 
worked about the same but was not as expensive.

I've found references to iron wire making in 1565 for use in making "cards" 
used to comb sheep's wool.

Also bare "Bell Wire" which was used with mechanical force like in a hotel or 
mansion where the servants were called by ringing a bell.

But have not been able to get a date and application for copper wire.  Maybe it 
was "Bell Wire"?

Anyone know when and why copper wire came about?

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com