The disappearance of darkness

Discussion in 'Digital Cameras' started by Me, May 7, 2013.

  1. Me

    Eric Stevens Guest

    So the first thing you do when responding to my question is postulate
    circumstances when it is irrlevant. Brilliant.
    Whatever you built in the 70s would not have been what is known as
    'high fidelity'. Whatever you were doing would not have made much
    difference.
    There are obviously some things you don't understand. And never will
    by the look of it. Hint - consider the effects on the feedback loop.
     
    Eric Stevens, May 26, 2013
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  2. That is exactly my point -- thet you can be misled by blidly following
    obvious "evidence-based" scientific experiments if you haven't taken
    the care to make explicit the underlying assumptions and made sure
    that the implied models hold.
     
    Chris Malcolm, May 26, 2013
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  3. Me

    Alan Browne Guest

    Again there are two forms.

    Corona discharge has a 'crackling' sound. (dry air).

    Magnetic effect has a humming noise. (humid air)
     
    Alan Browne, May 26, 2013
  4. Me

    Eric Stevens Guest

    Sorry. I missed that.
     
    Eric Stevens, May 26, 2013
  5. Me

    BobF Guest

    This is what you said:

    Irrelevent? **** YOU'RE STUPID!!
    Totally missed the point you FUCKING ASSHOLE!

    F U C K O F F !!


    - P L O N K -
     
    BobF, May 27, 2013
  6. Me

    Eric Stevens Guest

    'Two forms' of humming I presume.

    There is a third: vortex shedding induced by wind.

    What is the source of the magnetic field in your "Magnetic Effect"
    with which the current interacts and why is it only present when the
    air is humid?
     
    Eric Stevens, May 27, 2013
  7. Me

    Eric Stevens Guest

    You somehow overlooked this bit:
     
    Eric Stevens, May 27, 2013
  8. Me

    Trevor Guest

    An obvious contradiction. An experiment is *not* "evidence based" if it
    relies on unproven assumptions and models.
    That's how psuedo science works of course.

    Trevor.
     
    Trevor, May 27, 2013
  9. Me

    Alan Browne Guest

    No. The crackling sound is not all like a hum.
    We were addressing the electrical form of noise - most often heard when
    the air is still. If it makes you feel warm and fuzzy nobody denies
    that wind can make wires hum.
    When the air is humid there is something to make noise (water droplets
    moving around). The magnetic field is generally present at all times.
    Think about it. Let your compass guide you.
     
    Alan Browne, May 27, 2013
  10. Me

    Eric Stevens Guest

    .... and I replied
    So we weren't just addressing the electrical form of noise. We were
    discussing the humming of power lines.
    I thought you would be relying on the earth's magnetic field. This
    shouldn't be affected by humidity. Nor should the water droplets be
    affected by magnetism. They do however produce a leakage path which
    reduces the dielectric strength of the air.
     
    Eric Stevens, May 27, 2013
  11. Me

    Whisky-dave Guest

    it shows that some people don;t know what they';re talking about.
     
    Whisky-dave, May 28, 2013
  12. Me

    Whisky-dave Guest

    I guess you're not married. ;-)
     
    Whisky-dave, May 28, 2013
  13. Me

    Whisky-dave Guest

     
    Whisky-dave, May 28, 2013
  14. Me

    Whisky-dave Guest

    So it's not really the wires that are making the noise/hum or crackling it's the molecules in the air producing changes in pressure.
    I don;t think you can hear current flowing through a wire if it were in a vacumm or in space :)

    I seem to remmeber some definition of current from school physics in that a curretn of 1 amp flowing through two parelle conductors 1 metre apart in a vacumm produces as for of 1 X 10^-7 newtons of force.
    This rapid changing of force is what makes the 'noise' by dispacing the air.
     
    Whisky-dave, May 28, 2013
  15. The problem is that this is only obvious at first glance.
    In that case a great deal of public medical policy is pseudo
    science.

    It's also well known to be the case that in periods of what Kuhn
    called "normal science" (in "The Structure of Scientific Revolutions")
    the assumptions and models are usually not made explicit. Plus the
    assumptions and models underlying a specific scientific paradigm are
    only provisionally proved by the ongoing success of the paradigm. As
    Popper pointed out what is often taken to have been scientifically
    proved is in fact really only so far not disproved.
     
    Chris Malcolm, May 28, 2013
  16. Me

    J. Clarke Guest

    Would you be kind enough to provide an example of an experiment in which
    "assumptions and models" affect the outcome?
     
    J. Clarke, May 28, 2013
  17. Experiment as in "the measured raw results" or as in "the
    results after evaluating the measurements"?

    -Wolfgang
     
    Wolfgang Weisselberg, May 28, 2013
  18. Me

    Eric Stevens Guest

     
    Eric Stevens, May 28, 2013
  19. Me

    Alan Browne Guest

    I didn't write that phrase so don't attribute it to me.
    But the character of the noise would be. Again, the character of the
    noise very is different in humid and dry conditions.
    Never said they would. But pause on that point. Water droplets can
    indeed carry a charge (either positive or negative) and with such a
    charge would be induced to oscillate in the field generated by the
    wires. No confirmation on this but it's possible.
    Certainly.

    Anyway, you may have the last word.
     
    Alan Browne, May 29, 2013
  20. Me

    Alan Browne Guest

    Whether the noise is the wire vibrating or the air vibrating, eventually
    molecules do need to move to transmit noise (pressure waves).
    As I stated elsewhere, the noise is very different depending on the
    humidity. In dry air a 'crackling' sound, in humid, more of a hum.

    Currents cause a force where there is a magnetic field (the definition
    you put up above). In turn this can make a noise. (That's how
    loudspeakers work).

    Voltage causes sparking and discharges.
     
    Alan Browne, May 29, 2013
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