Old Nick scribed in
:

It's a 2-part device. The first part is a U-shaped chunk
of iron with ends of the U in a vee shape so that an
armature can be set inside them. A coil is wound around
the U and AC is applied to it.

yup
can also double as a tape eraser. cassette, 1/4" reel to reel, VHS.
anything. just put a sheet of cardboard across the top and slide the
tape around over the poles for a bit.

The second part is a set of probes and some kind of
indicator.

my Dad's one has a light bulb for that. the probes have 230 volts
across them when switched on.

into the windings of the armature. You can then probe
the segments of the commutator and test for shorts or
opens.

I've never been sure exactly what to look for with this thing. with
my Dremel tha thad a couple of open windings I just found them with
an OHM meter.

Spike....Spike? Hello?

needle noddle nooooooooooooooooo

swarf, steam and wind

--
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