Could be "thermal hysteresis" like in Ed Stone's Amoco Bldg. The stone
expands thermally but does not return completely to its original length,
multiple cycles causes ratcheting of the face of the stone and also greatly
weakening of the panel. Mostly occurs in thin panel Carrara marble or others
of similar characteristics.

Eric Hammarberg
Associate Director of Preservation
Associate
LZA Technology
641 Avenue of the Americas
New York, NY 10011-2014
Telephone: 917.661.8176 (Direct)
Mobile: 917.439.3537
Fax: 917.661.8177 (Direct)
email:  [log in to unmask]


-----Original Message-----
From: Ralph Walter [mailto:[log in to unmask]]
Sent: Sunday, March 31, 2002 2:47 PM
To: [log in to unmask]
Subject: Re: Getting Bent Marble


Mark,

Offhand, I don't remember why the marble bulged on the ex-Times building,
but
will check tomorrow with the genius (a favorite of the Lurking Raydome) who
sits next to me and who worked on it.

Seems to me it was an expansion/contraction problem aggravated by the stone
being on the S elevation and too thin, but I'm not sure.

Ralph

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To terminate puerile preservation prattling among pals and the
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