Amanda,

I agree with Janice.  I would fill it as, for example, +/- 3% RH and +/- 2
degrees F, or whatever are your actual ranges.  I believe AAM made a bit of
a mistake?  They either need to remove the word "percentage" or state
"percentage for RH and degrees for temperature."  Percentage doesn't fit for
temperature.  Good luck!

Marc

American Conservation Consortium, Ltd.
     4 Rockville Road
     Broad Brook, CT 06016
     www.conservator.com
     860-386-6058

*Collections Preservation Consultation
*Conservation Assessments & Surveys
*Low-Tech Environmental Control
*Moisture Management Solutions
*Collections in Historic Structures
*Conservation Treatment of:
     Furniture
     Painted Wood
     Horse-Drawn Vehicles
     Architectural Interiors

Marc A. Williams, President
     MS in Art Conservation, Winterthur Museum Program
     Former Chief Wooden Object Conservator, Smithsonian Institution
     Fellow, American Institute for Conservation (AIC)


----- Original Message -----
From: "Amanda" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 17, 2006 5:28 PM
Subject: Re: [MUSEUM-L] variation percentages?


> Marc:
>
> I'm actually trying to come up with an answer to question 3.11 of the AAM
> Standard Facility Report. The question reads: "What is the maximum usual
> variation percentage within a 24-hour period in your temporary exhibition
> gallery? There is a blank for both temp & %RH for spring/summer &
> fall/winter.
>
> Thanks so much for offering to help. I hope you can explain this to me
more
> clearly than the form does!
>
> Thanks again,
> Amanda
>
> -----Original Message-----
> From: Museum discussion list [mailto:[log in to unmask]]On
> Behalf Of Marc Williams
> Sent: Friday, November 17, 2006 4:08 PM
> To: [log in to unmask]
> Subject: Re: variation percentages?
>
>
> Amanda,
>
> I'm not exactly sure what question you are asking, but I'll try to answer
> anyway.  RH is a percentage.  Therefore, any variation is already a
> percentage.  For example, if RH ran from 50% to 70% over a period, there
was
> a 20% RH variation.  If this is what you are looking for, you're done.  If
> not, please refine the question if you can.  Temperature is much more
> difficult.  Assuming you are working in the Fahrenheit system,
temperatures
> can run from -451 degrees to +infinity.  Thus, it is not really possible
to
> assign a percentage to a variation.  You technically could use a
percentage
> of variation from a given number, for example inaccuracy of a thermometer
of
> +/- 10%.  The trouble here is that if the temperature reads 0, technically
> there is no variation (10% of 0 = 0), while if it reads 100, the variation
> is 10 degrees (10% of 100 = 10).  Normally variation for temperature is
> given as +/- degrees F, not as a percentage.  Again, please clarify if
this
> does not help.
>
> Marc
>
> American Conservation Consortium, Ltd.
>      4 Rockville Road
>      Broad Brook, CT 06016
>      www.conservator.com
>      860-386-6058
>
> *Collections Preservation Consultation
> *Conservation Assessments & Surveys
> *Low-Tech Environmental Control
> *Moisture Management Solutions
> *Collections in Historic Structures
> *Conservation Treatment of:
>      Furniture
>      Painted Wood
>      Horse-Drawn Vehicles
>      Architectural Interiors
>
> Marc A. Williams, President
>      MS in Art Conservation, Winterthur Museum Program
>      Former Chief Wooden Object Conservator, Smithsonian Institution
>      Fellow, American Institute for Conservation (AIC)
>
>
> ----- Original Message -----
> From: "Amanda Thompson Dyer" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, November 17, 2006 3:57 PM
> Subject: [MUSEUM-L] variation percentages?
>
>
> Hello Everyone:
>
> At the risk of revealing my math deficiency, how does one determine the
> variation percentage of temperature (Fahrenheit) and RH within a certain
> period? I know there has to be a formula out there somewhere, but I'm not
> having much luck finding it. (I think I may be suffering from a
debilitating
> case
> of Friday-itis.)
>
> Thanks!
> Amanda Thompson Dyer
> Curator
> Bell County Museum
>
> =========================================================
> Important Subscriber Information:
>
> The Museum-L FAQ file is located at
> http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed
> information about the listserv commands by sending a one line e-mail
message
> to [log in to unmask] . The body of the message should read
"help"
> (without the quotes).
>
> If you decide to leave Museum-L, please send a one line e-mail message to
> [log in to unmask] . The body of the message should read
"Signoff
> Museum-L" (without the quotes).
>
> =========================================================
> Important Subscriber Information:
>
> The Museum-L FAQ file is located at
> http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed
> information about the listserv commands by sending a one line e-mail
message
> to [log in to unmask] . The body of the message should read
"help"
> (without the quotes).
>
> If you decide to leave Museum-L, please send a one line e-mail message to
> [log in to unmask] . The body of the message should read
"Signoff
> Museum-L" (without the quotes).
>
> =========================================================
> Important Subscriber Information:
>
> The Museum-L FAQ file is located at
http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed
information about the listserv commands by sending a one line e-mail message
to [log in to unmask] . The body of the message should read "help"
(without the quotes).
>
> If you decide to leave Museum-L, please send a one line e-mail message to
[log in to unmask] . The body of the message should read "Signoff
Museum-L" (without the quotes).

=========================================================
Important Subscriber Information:

The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes).

If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).