[GreenKeys] Copper Wire?

[Brooke Clarke]

Hi Bob:

Yes, I've read about jewelry using wire, but that was in very short lengths, 
nowhere near the 60 foot lengths that Henry used to make his electromagnets.

I think "Bell wire" might have been copper, but I haven't been able to find a 
reference.

Robeling started in 1850, mainly to make wire rope for bridges, so they did not 
supply Henry.

I know Ohm used thermoelectric generators as his source of electricity since 
wet batteries had too much internal resistance but don't know what metal he 
used for the wire, other than references to silver.  The IEEE papers on Ohm 
require purchase and so I don't have them.

Have Fun,

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



Bob Camp wrote:
> Hi
> 
> Wire in jewelry has been around for a *long* time. Drawing wire in  
> small batches isn't all that high tech. My guess is that copper wire  in 
> some form dates way back (say 2000 BC). It's safe to assume that  there 
> was copper wire lying around well before it had any use for  conducting 
> electricity.
> 
> Bob
> 
> On Aug 30, 2007, at 1:08 PM, Brooke Clarke wrote:
> 
>> 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
>>
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>