NavList:

   

Reply

Some nuclear power authorities have prosecuted for "theft of service"
for people doing the magic fluorescent light trick under their power lines.

David Pike wrote:
>
> There are certainly funny things going on around 132kv overhead power 
cables.  I know this because every time we walk under one my wife’s hair 
stands on end (or perhaps it’s jumping up and down at 50-60 cycles, but 
that’s outside the limits of the human eye to notice).  Funnily enough, my 
hair’s unaffected.  Perhaps it’s given up the ghost after all those years 
under a cap or flying helmet.  If you want to amaze your grandchildren for a 
change, rather than them continuing to amaze you, take a four foot neon light 
tube with you and point it towards the cables.  You’ll be acknowledged as a 
true space magician.
>
> I don’t think you can come up with an answer to the difference in effects on 
compasses without knowing the particular magnetic field transducer in Paul’s 
electronic compass.  Such transducers must have come on a lot over the last 
30 years from electromagnetic flux valves to tiny chips that are designed to 
work in three axes.  I can vaguely remember flux valves involve picking up a 
near saturated ac magnetic field which has been modified by superimposing the 
Earth’s field.  Under HT cables is probably not the best place to attempt to 
use such a transducer.
>
> The latest tiny three axis chips look like magic, and I was prepared to 
leave understanding them to younger generations.  This discussion’s tempted 
me to take another look.  More soon maybe!
> DaveP
> One time Navigational Guidance Lecturer, RAF School of Navigation

   

Reply