I'm a heavy equipment operator.solitarycanary said:^^ and there you have it. There is not much more that can be learned about glassmaking techniques than has already been documented, at least not here in the states. It went through a radical change from 1840s to 1920s. All methods have been well documented, discussed, archived, etc etc. Anything we find at this point just adds to what is already known. Hence the reason most of them would be recycled. How did you end up on such a dig? just curious.