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Re: [BKARTS] books, heat, humidity, warping



Thanks for your response. I bought a Honeywell item that measures
temperature and RH. This morning, I purchased a humidifier and am slowly
bringing up the RH.

Again, thanks.

Russell duPont
Books, Prints, & Ephemera

specializing in reference
materials on the fine &
decorative arts, Americana,
& travel in distant lands.

41 Star Street
Whitman, MA 02382

Phone: 781-447-4091
Fax: 781-447-1927

Website: www.dupontbooks.com

-----Original Message-----
From: Book_Arts-L [mailto:BOOK_ARTS-L@xxxxxxxxxxxxxxxx]On Behalf Of
Blunt, Dorothy
Sent: Monday, January 12, 2004 4:57 PM
To: BOOK_ARTS-L@xxxxxxxxxxxxxxxx
Subject: Re: [BKARTS] books, heat, humidity, warping


Russell -

When you say you've measured the humidity at 24 - 25%, are you measuring
Relative Humidity?  What kind of device are you using to measure it?

24 - 25% is extremely low for Relative Humidity - 45% is much better for
housing paper, leather, parchment and the other items that you probably have
in your collection (and, better for you, too).  It probably wouldn't explain
the curl of your book covers.

However, if you've measured absolute humidity, 25 is pretty high, and that
would explain the curl of your books.

Dolly Blunt
Preservation Officer
Florida State Archives



-----Original Message-----
From: Russell duPont [mailto:dupbooks@xxxxxxxx]
Sent: Monday, January 12, 2004 1:19 PM
To: BOOK_ARTS-L@xxxxxxxxxxxxxxxx
Subject: books, heat, humidity, warping


For 11 years, my shop was on the fourth floor of an old factory building
where it was cool during the winter and warm during the summer. Last year, I
moved quarters to the first floor of the building. I have a 6" well-wrapped
steam pipe that goes across the rear of my space along the ceiling, right
near the windows, and a 2" pipe along the lower edge of the rear wall. The
nearest shelving is about 6' away. My space is 75+ in the winter and about
the same in the summer.

I've noticed that some of the books, especially those about 12" high, are
developing a very slight curl, mostly on the rear cover. One book, however,
the oblong Wisconsin Death Trip, though, has both covers severly curled. Not
all books are effected.

I began measuring the heat and humidity today; humidity registers at 24-25%,
what I understand is a normal range; the temperature today measured 64-66F
[the heat is lowered in the building on weekends].

Any speculations as to what is causing this and how I can correct it before
things get out of hand? Any suggestions will be appreciated.

Thanks.

Russell duPont
Books, Prints, & Ephemera

specializing in reference
materials on the fine &
decorative arts, Americana,
& travel in distant lands.

41 Star Street
Whitman, MA 02382

Phone: 781-447-4091
Fax: 781-447-1927

Website: www.dupontbooks.com


Russell duPont, Books, Prints, Ephemera & Art

Reference materials on the fine and decorative arts,
Americana, Ephemera, and Travel in Distant Lands.

41 Star Street
Whitman, MA 02382
781-447-4091
www.dupontbooks.com

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        Archive maintained and suppported by Conservation OnLine
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     *Postings may not be re-printed in any form without the express
     consent of the author - Please respect their contributions & ©*

        Archive maintained and suppported by Conservation OnLine
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