In the published version of my thesis (1985   The Mill Creek Site and  
Pattern Recognition in Historical Archaeology.  Mackinac Island State  
Park Commission, Archaeological Completion Report Series, Number 10,  
265 pp.,  Mackinac Island, Michigan.) I analyzed about 15,000 flat  
glass fragments from three nineteenth century building ruins based on  
thickness distributions and Moir's formulaic dating approach.   I got  
different results than Moir did, but some interesting patterns.  You  
might consider having a look for comparative purposes, at least.
PEM

-----Original Message-----
>> From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of
>> Benjamin Carter
>> Sent: Friday, February 19, 2010 9:09 AM
>> To: [log in to unmask]
>> Subject: Plate Glass references
>>
>> All,
>>
>> I am having a bit of trouble finding references for the dating of  
>> plate
>> glass.
>>
>> There are, of course, far too many resources for bottle and table  
>> glass,
>>
>> but I haven't had much luck finding out any details about plate  
>> glass.
>>
>> I have mostly plate glass with a bluish cast, which I assume is soda
>> glass. But, I also have, from the same contexts, some extremely  
>> clear plate
>> glass. Why are these different? I assume that 'decolorizing' agents  
>> were use
>> for the clear glass. Is there a time when this began. The site is  
>> fairly
>> well dated- 1790s-1811. Would a change in glass types
>>
>> have happened at this time? Or, is it likely that the clear glass is
>> intrusive. Many of my contexts are fairly close to the surface.
>>
>> Cheers,
>> Ben Carter
>>
>>
>>
>

Patrick E. Martin
Professor of Archaeology and Chair
Department of Social Sciences
Michigan Technological University
Houghton, MI  49931
phone 906-487-2070,email [log in to unmask]
www.industrialarchaeology.net