[GreenKeys] Nice old picture

[Dave Horsfall]

On Tue, 9 Feb 2016, Richard Knoppow wrote:

> Maybe different frequencies or DC being available.  In the Los Angeles 
> area the City Department of Water and Power was 60Hz but Burbank, and 
> some other areas were 50Hz. Warner Brothers, in Burbank, had motor 
> generators to convert from 50 to 60 Hz for their RCA sound equipment 
> that used synchronous motors. 

Didn't someone post an article here about the US' various power systems?  
I.e. DC/25/50/60/etc?  Can't seem to find it...

I know that Edison, when Tesla's polyphase AC system was challenging his 
DC system, used to round up every stray dog and electrocute them with AC, 
to show just how dangerous it was...  I'll bet that he never did it with 
DC :-)  The irony is that DC is far more dangerous, because the muscles 
clamp and cannot let go; with AC, there is at least a zero-crossing point 
(well, that's what why eletrician Dad, bless him, taught me).

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."