How to tell if a biker has a pin in his leg

Different league, but I got some Neodymium notice board magnets from
eaby to replace the rubbish we normally have. Bloody great they are.

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Using the patented Mavis Beacon "Hunt&Peck" Technique, Champ

Airport metal detectors don't rely on the metal being magnetic.

If you remember, the little metal detector I brought to France found
your tin leg quite successfully.

 

There has to be some minimum threshold or they'd be going off from the
rivets in denim jeans, etc., essentially rendering them useless.

 

There's also an element of random selection. Which is better than racial
profiling and harder to beat.

 

I thought that worked by eddy currents.

Like the drag cup in a speedo - its made of aluminium and not magnetic, but
the spinning magnet spinning next to it drags it round.

The drag cup is like a shorted turn so the energy imparted to it causes it
to move - if you locked the drag cup and spun the magnet fast enough the
energy would heat the drag cup, I sort of imagined that's how an induction
hob worked.

 

My guess is the resistivity of the pots & pans is fairly critical to making
an induction hob work. According to Wikipedia, heating due to ferromagnetic
hysteresis accounts for at most 10% of the heating, the rest is from eddy
currents through the resistive bulk material.

http://en.wikipedia.org/wiki/Induction_cooker

 

Don't they have to be *really* flat as well?

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Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3
Tyger, Tyger Burning Bright (Remove rust to reply)
116 Giulietta 3.0l Sprint 1.7 GTV TS GT 3.2 V6
Triumph Sprint ST 1050: It's blue, see.
#www.cuore-sportivo.co.uk

 

Where flat = as close as possible. Square laws and distance and shit.