Another thread has an interesting discussion of magnets, which
reminded me of an on-topic question [kinda] about magnets.
How do those magnetic bases used for dial indicators work? The lever
to switch the magnet on or off seems to have too little resistance to
be simple mechanical advantage in separating the base from the iron
table it was held to so strongly.
Make the obvious change in the return address to reply by email.
The base is made of two separate ferrous pieces separated by a non-ferrous
divider (if you look closely you can see the joint between the two pieces).
The magent inside the two pieces can rotate. In the ON position, the north
end of the magnet is enclosed by one of the ferrous pieces and the south end
of the magent is enlosed by the other ferrous piece. In the off position,
the magnetic poles are half inside each ferrous pirce. The ferrous metal
baiscallu short-circuits the magnetic flux lines. Most of the magnetic
field stays inside the ferrous metal and and very little goes out into the
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