Thanks Ilene, Ken & Judith, your help is appreciated.  Until a
reviewer asked, it had never occurred to me that the stone might be
anything other than stone.  Fear of getting something like this wrong
prompted the question.  But, I think Ken got at the heart of the
matter.  I do think that if it had been anything other than stone, my
stomach would have let me know at first touch, if not sight.  But, I
sure got some interesting help along the way.

Oh...and Ralph was helpful too.

-jc


On Jun 21, 2005, at 12:48 PM, Ilene R. Tyler wrote:

> You can also observe from cracking whether cracks are due to typical
> stone stress fractures, or associated with a buried but corroding
> steel
> reinforcing bar.
>
>
>
>
>
> QUINN EVANS | ARCHITECTS
>
> Ilene R. Tyler, FAIA, FAPT
>
> 219 1/2 N. Main Street
> Ann Arbor, MI  48104
> [log in to unmask]
> www.quinnevans.com
> v 734.663.5888
> f 734.663.5044
>
> ----------------------------------------------------------------------
>
> Date:    Mon, 20 Jun 2005 09:56:44 -0400
> From:    "Judith E. Selwyn" <[log in to unmask]>
> Subject: Re: ID Cast Stone vs natural?
>
> The simple answer is yes.  Sometimes it takes a second glance.
> Most of
> the thirties stuff was made to look like limestone.  In unweathered
> (sheltered) areas it almost always develops a yellow cast and some
> black
> crusting.  In exposed areas, it gets more aggregate exposed.
>
>
> Dr. Judith E. Selwyn
> Preservation Technology Associates, Inc.
> 2 Center Plaza, Suite 400
> Boston, MA 02108
>
> 617 598-2255
> fax 617 227-5535
> [log in to unmask]
> ----- Original Message -----
> From: "John Callan" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, June 19, 2005 2:34 PM
> Subject: [BP] ID Cast Stone vs natural?
>
>
>
>> Are there any readily observable differences between good 1930's cast
>> stone and natural stone?
>>
>> -jc
>>
>>
>
> --
> To terminate puerile preservation prattling among pals and the
> uncoffee-ed, or to change your settings, go to:
> <http://maelstrom.stjohns.edu/archives/bullamanka-pinheads.html>
>

--
To terminate puerile preservation prattling among pals and the
uncoffee-ed, or to change your settings, go to:
<http://maelstrom.stjohns.edu/archives/bullamanka-pinheads.html>