TDC bulbs

[P3D Harry Poster <hposter@xxxxxxxxxxxxxxxx>]

William Carter notes  >>It's a curiosity to me though, why it is that as the
tungsten wire gets thinner while depositing itself all over the inside of
the bulb, that the wire should be burning brighter and bluer, yet the output
is so filtered as to give 
entirely opposite results.


  If I remember my electronics (a drop out from EE school)...AC current
travels on the surface of a wire, as opposed to DC which travels throughout.
If the wire shrinks (through evaporation), then the surface area is
considerably smaller, and the AC current would be severly restricted. 
  Also, assuming the bulb manufacturers remember what I do, then they might
find it cheaper to coat the EXTERIOR of the wire with a special material,
and if that's really the case, as the coating burns off, AC current would
travel over a less efficient core material, and again (in addition) the
current and brightness would quickly be reduced.

                 Just my guess...Harry


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