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Vaschy's rules

Discussion in 'Electronic Basics' started by ra_v, Jun 20, 2004.

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  1. ra_v

    ra_v Guest

    Hello.
    I'm trying to find something about Vaschy's rules (in electrotechnics,
    electric circuits). Can you tell me something about them?


    best regards
    ra_v
     
  2. Tom Biasi

    Tom Biasi Guest

    Hi,
    I really don't know what rules you are talking about.
    I have encountered a few guys named Vaschy in electronics theory but do not
    recall any rules attributed to them.
    Tom
     
  3. I assume he means the mathematical physicist Aimée Vaschy (1857–1899),
    who contributed to the Thevenin and Norton circuit equivalence
    theorems.
     
  4. Tom Biasi

    Tom Biasi Guest

    Hi Terry,
    Your recollection is far better than mine. :)
    Tom
     
  5. Undeserved praise - Google gets the credit!

    And in fact I now suspect my conclusion was superficial. It seems he
    suggested Thevenin was *wrong*, so Vaschy can hardly be called a
    'contributor'. Here's a brief extract from my earlier source:
    http://cmc.rice.edu/docs/docs/Joh2001Aug1Originsoft.pdf:

    "The year 1883 marked publication of at least four papers [5],
    [18]–[20] in Annales Télégraphiques, the second of which [5] described
    what he thought was his new equivalent circuit result. Excited by his
    result, Thévenin wanted to report it to the French Academy of
    Sciences. According to Suchet, Thévenin asked a colleague, the
    mathematical physicist Aimée Vaschy (1857–1899), to comment on the
    paper. Vaschy thought the result incorrect. Thévenin consulted others,
    and varied opinions were offered. Eventually his previously published
    paper [5] was published virtually verbatim1 in Compte Rendu in the
    same year."

    A more thorough search turns up more work by Vaschy that I think more
    relevant.

    If the OP is still interested, here are a few more links:
    http://arxiv.org/PS_cache/physics/pdf/0309/0309040.pdf
    http://www.esanet.it/chez_basilio/antenna.htm
    http://ing.pub.ro/engleza/programa/sem3.htm
    http://software.ucv.ro/Cursuri/Electrical_engineering2/electrical_engineering2.html

    Those last two make explicit reference to 'Vaschy Theorem', as part of
    circuit network theory. The most I could find was that it is 'The null
    action sources theorems'. But nowhere could I find what the actual
    theorems *are*.
     
  6. Don Kelly

    Don Kelly Guest

    r
    I suspect (not prove-if Vaschy can be wrong then so can I) that it is
    simply the situation where if you take two equal ideal voltage sources of
    opposite polarity in series (or two such current sources in parallel) the
    result is null, zip, nada. Hardly worth theorem status. This along with
    superposition can be used to prove Thevenin & Norton (And, as well, to show
    where these theorems are valid and where they are not valid.

    Don Kelly

    remove the urine to answe
     
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