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Some technological changes were expensive and not adopted by glass makers until it became an "adapt or perish" issue and many glass factories just perished.The shift to the fully automated bottle machine from mouth-blown and some semi-automatic methods in the early 20th century is the classic example (Toulouse 1967, 1969a). The same bottle could have been recycled and reused many times for many years before finally being discarded - entire or broken (Busch 1987).Shape is more indicative of function - i.e., what the bottle was used for or contained - but even that has a myriad of exceptions.See the Bottle Typing/Diagnostic Shapes page for more information on the subject..While running a bottle through the key questions, the user is frequently directed to move to other website pages to explain diagnostic features and concepts as well as to add depth and/or precision to the initial dating estimate.
(The two products were from separate companies which were cross-town [Sacramento, CA.] rivals during the late 19th to early 20th century.When a likely or known "older" item is found in a known "newer" site it is referred to as deposition lag.An example of this is the finding of a few pontil scarred utilitarian bottles among otherwise late 19th or early 20th century refuse.Unfortunately, the complexities of precisely dating bottles is beyond the scope of any simple key.A substantial amount of bottle type specific information must be reviewed by a user to increase the probability of dating accuracy.