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Subject: [ROOTS-L] Old picture on disk

You might want to check out a website, any that you find, that mentions the  
time period various types of photographic processes were used.  Some of the  
old metal pictures might have been taken as far back as the civil war called 
tin  types, but whether or not the process was still being used in the 1900s may 
be  questionable.
 
So type in the word photography or photographic processes or anything that  
might hit upon a website that discusses this sort of thing.  You might even  go 
to your local library and look at books on photography.  There you  might be 
able to find specific examples shown in the various books on the  subject.
 
Christie Trapp