Dating glass bottles australia
Still all true today. These bottles will, however, have the vertical side mold seam progressing all the way to the very top of the finish side, just not onto the rim. This is also pointed out on the image above; click to enlarge. Milk Bottles - Many milk bottles made with press-and-blow machines from the very early s into at least the s resulted in vertical side mold seams that gradually fade out on the neck distinctly below the base of the finish. Fire Polishing - Occasionally encountered machine-made bottles may have fire polished finish rims - a process which eradicated evidence of the neck-ring mold seam on the rim of the bottle. The best the following key can do is get a user to a reliably close dating range estimate. Click on utilitarian bottles or "specialty" bottles to view the portion of the Glossary Page that covers these subjects.
Go to QUESTION 5 for a possible dating refinement based on the method of finish application, though some of the diagnostic features can be masked by the turn-mold production process. The dating guidelines found on these Dating Pages and the entire website do not always work well with what the author calls "specialty" bottles click for more information. It is suggested that if you only bookmark one page of this website for future reference, that it be the Website Map. The two products were from separate companies which were cross-town [Sacramento, CA. For a broader discussion of this subject see Lockhart, et al. Newman wryly recognized all this with his reworking of an old saying: Reuse, of course, does not change the manufacturing date of the bottle itself, but care must be exercised when using the known date of one or a few bottles to date other items found from the same context. The beer bottle pictured to the above left is a classic example of a utilitarian bottle from the late 19th century that was typically reused. Other diagnostic tools must be used to date these items. Both are hard questions to answer and the answer is somewhat arbitrary in the end. The earlier green glass ink bottle is also certainly machine-made, most likely on an early semi-automatic, blow-and-blow machine based on its crudeness and lack of a suction scar. Researched historical information of variable depth and quality exists for thousands of different - typically embossed - bottles. If using this site for the dating or typing of a known or likely Canadian-made bottle, keep this in mind as the reliability of the information may be reduced. Base type for examples, click here: With each chart the reader will find accompanying pictures to further aid in bottle identification and age. The closer to the top of the bottle the seams extend, the more recent was the production of the bottle. This entire website is essentially a "key" - albeit a complex one - to the dating and typing typology of historic bottles. Even then the bottles discussed in depth are so primarily to illustrate the presented information and concepts. Where did the bottle come from, i. While these two characteristics are often a strong clue to age, readers will be further helped by developing an understanding how the various categories of bottles changed over time. Use that page to get a feel for the structure of this website and to access any of the other web pages. They will also have other machine-made characteristics as described on the Machine-made Bottles page. A yet a couple additional factors to keep in mind in the dating of bottles Stell Newman Newman The concept is that the higher the side mold seam on the bottle the later it was made - at least in the era from the early to mid 19th century until the first few decades of the 20th century. Click on the image to the right to view both mold seam features pointed out on a press-and-blow machine manufactured milk bottle made by the Pacific Coast Glass Company San Francisco, CA.
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