Re: gEDA-user: hydraulic symbols and schematics

["Bert Timmerman" <bert.timmerman@xxxxxxxxx>]

Hi Bob,

Do not discuss patents here please !

This is highly contageous and attracts law suits.

Without the mentioning of patents the general idea would have come across as
well.

Kind regards,

Bert Timmerman.

> -----Original Message-----
> From: geda-user-bounces@xxxxxxxxxxxxxx 
> [mailto:geda-user-bounces@xxxxxxxxxxxxxx] On Behalf Of Bob Paddock
> Sent: Wednesday, April 07, 2010 8:10 PM
> To: gEDA user mailing list
> Subject: Re: gEDA-user: hydraulic symbols and schematics
> 
> > If you look at some hydraulic schematics, you'll see a rich duality 
> > between electric and hydraulic circuits.  For example, the pressure 
> > drop across an orifice is analogous to the voltage drop across a 
> > resistor.  Hydraulic power is pressure * flow (i.e. V * I).
> 
> http://www.unusualresearch.com/Pump/bellocq.htm
> 
> US Patent: 1,941,593 01/02/1934 "PUMPING" [This patent is 
> interesting in that it shows the plumbing equivalent to 
> resonance circuits, high pass, low pass, and band pass filters.]
> 
> http://v3.espacenet.com/publicationDetails/biblio?DB=EPODOC&ad
jacent=true&locale=en_EP&FT=D&date=19340102&CC=US&NR=1941593A&KC=A
> 
> 
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> 



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