Miata Mailing List: September 1997, Message #237
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From: 	Ric Allan <ric@florence.ds.adp.com>

Subject: RE: temp gauge position Was Re: Thermostats

Date: 	Tue, 2 Sep 1997 12:06:19 +0000



Hysteresis - The failure of a property that has been changed by an =

external agent to return to its original value when the cause of the =

change is removed. ... American Heritage Dictionary, 1982



In truth, it might be better stated as hysteresis-like behavior (i.e. - =

reaction up to temperature change unlike action down) but it is not a =

'lag'... which normally refers to what happens in one direction of a =

process... but then local semantics screws the hell out of any =

reasonable discussion of statements made in the spoke or printed word if =

prior normalization of terms has not been properly addressed...   ;-))))



Ric Allan

Braveheart 97M (still stripe-less - but that's another story)

Loveland, Ohio





-----Original Message-----

From:	Joseph Haefeli & Guppy [SMTP:miata@unoco.edu]

Sent:	Monday, September 01, 1997 11:58 PM

To:	Multiple recipients of list

Subject:	Re: temp gauge position Was Re: Thermostats



>> One other thing to contemplate is that the thermo switch for the fans =

has a

>> differential component: it turns on at 207 F., but doesn't shut off =

until

>> around 195 F.

>

>Just to pick nits - that behavior would be called 'hysteresis'



Didn't your mom tell you not to pick at your nits?  Hysteresis is when =

an effect lags after its cause.  There's no lagging involved here. The =

design of the switch is to close at 207, open at 195.





-Joseph & Professor Guppy