a web page with good basic info on glass plate negatives and their
preservation is http://slisweb.lis.wisc.edu/~hamuir/678/glass.html




                                                                                                                                       
                      "T. Arron                                                                                                        
                      Kotlensky"               To:       [log in to unmask]                                                              
                      <[log in to unmask]        cc:       (bcc: Vergil Noble/MWAC/NPS)                                                  
                      >                        Subject:  Early photography question                                                    
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                      HISTORICAL                                                                                                       
                      ARCHAEOLOGY                                                                                                      
                      <[log in to unmask]                                                                                                
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                      08/10/2006 03:04                                                                                                 
                      PM AST                                                                                                           
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                      HISTORICAL                                                                                                       
                      ARCHAEOLOGY                                                                                                      
                                                                                                                                       




Hello all.  A friend of a colleague of mine is looking for information
regarding what might be early photographic materials.  She wrote:

"A friend has some old glass
plates with a black powdery material on the back,
with sketches of some of the old Ishpeming
mines. I assume they were for making photographs,
but am not sure. He'd like to get a little
history on them."

Any thoughts?  Many thanks for your input.

-T. Arron Kotlensky