List -  The same thing was done at the Calvert House in Annapolis, Maryland.  An 18th century hypocaust was exposed, presumably once under an orangery attached to the house. When the hotel was built over it in the 1980s that particular room had a special floor installed of what looks like the standard bullet-proof, very thick plastic.  One walks in the room and can then look down at hypocaust.  It is rather unnerving to walk on, but it doesn't give way (yet).  It also required special lighting around the feature.  You can find a fuller description of the hypocaust in Anne Yentsch's wonderful book on the excavations and Calvert Family - Cambridge Unv. Press. if I recall correctly. I think the portals at Franklin Court were the model for this treatment.

Joe Dent
American University

-----Original Message-----
>From: "McAlexander, William" <[log in to unmask]>
>Sent: Feb 19, 2009 9:27 AM
>To: [log in to unmask]
>Subject: Re: Query
>
>James,
>
>I am unsure of how much you would like to have available for viewing.
>However, if memory serves correctly, in Philadelphia at Benjamin
>Franklin's home outside sub-walkway architectural features were encased
>with thick glass for viewing.  I believe that a similar thing was done
>for grave markers in the church at Jamestown.  I have also seen the use
>of glass encasing features on a prehistoric site about 15-20 years ago.
>I hope this helps.
>
>William E. McAlexander Jr.
>Environmental Division
>Arkansas State Highway and Transportation Department
>Little Rock, Ar 72209
>(501) 569-2078 
>
>-----Original Message-----
>From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of
>D'Angelo, James (Atlanta,GA-US)
>Sent: Thursday, February 19, 2009 8:04 AM
>To: [log in to unmask]
>Subject: Query
>
> 
>
>I am currently working on a master plan with a landscape architectural
>firm for an archaeological park at the site of a late 18th early 19th c.
>frontier fort in Georgia. The site has an interesting stockade wall
>trench feature with collapsed firebox feature that was probably situated
>within a corner blockhouse. Together these features probably represent
>the SW corner of the fort. I would like to preserve these features for
>visitors to see, but, of course, the features cannot be open to the
>weather. The minimum surface area is about 6' x 12'.  A photo of these
>features can be seen at
>http://archaeoseek.ning.com/profile/JamesDAngelo. Does anyone know of an
>example of enclosing such features for public view short of constructing
>a building over them?  Help with this will be greatly appreciated...
>
> 
>
>James J. D'Angelo, RPA, Ph.D.
>
>Archaeologist
>
>TRC 
>
>4155 Shackleford Road Suite 225
>
>Norcross, Georgia, 30093
>
>770.270.1192  x125 phone
>770.270.1392  fax
>404.580.2079 cell
>[log in to unmask]
>
> 
>
> 
>
>