Vaschy's rules

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

 

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

 

I assume he means the mathematical physicist Aimée Vaschy (1857–1899),
who contributed to the Thevenin and Norton circuit equivalence
theorems.

 

Hi Terry,
Your recollection is far better than mine.
Tom

 

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*.

 

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

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