A user may move to QUESTION 4 for one additional dating attribute based on pontil scars, though all these datable attributes free-blown, dip mold, and pontil scars overlap significantly. The base image below is of an late 19th to early 20th century barber bottle base with a very distinct blowpipe pontil scar with a little residual iron from the pontil rod. Ostensibly this was done to remove the mold seam "bump" that was sometimes left by earlier machines - an action which may have helped facilitate better sealing with crown caps, screw-thread caps, or similar closures which sealed on the rim of the finish. The best the following key can do is get a user to a reliably close dating range estimate. Unfortunately, the complexities of precisely dating bottles is beyond the scope of any simple key. This website created and managed by: 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. A key concept in historic bottle dating is the high probability i.
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Vertical side mold seam on the neck of a beer bottle ending well below the finish, indicating that it was at least partially handmade - ca. Air Products will build a world-scale liquid hydrogen plant at its La Porte facility to meet increasing customer needs.
Video: Dating a large manufacturer Glenfield Valves Ltd
Specialty bottles can be, of course, occasionally found on historic sites usually fragments, but occasionally intact but can rarely be used to help date the site because of the diagnostic problems and deposition lag issues noted above. There is frequent hyper-linking between the diagnostic characteristics and terminology listed on this page and other website pages. China Baowu Steel Group.
This termination of the side mold seam within the finish short of the rim Sheaffers ink or actually short of the finish itself green ink on these bottles makes it appear upon casual glance that these are mouth-blown bottles having either an improved tooled finish Sheaffers or an applied finish green ink.
Having stated the above, there are still many diagnostic features or characteristics that provide a high probability of both dating and typing a bottle with some precision.
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Also, the format and space constraints of a journal article do not allow for the elaboration and illustrations necessary to make a key function fully Jones b.
An example of this is the finding of a few pontil scarred utilitarian bottles among otherwise late 19th or early 20th century refuse. For brevity, most of the specific references are not noted in the key's narratives. 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.
The concentric rings are not always as obvious as the picture shows click to enlarge and sometimes not visible, though if present it is a conclusive diagnostic feature. A low probability though possible "NO" alternative is that the user has an unembossed, molded bottle with no visible vertical side mold seams. This technology lag makes some diagnostic characteristics better than others for dating.
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Return to the top of this page. A "NO" answer is much less likely than "YES" for this question as a very large majority of bottles made during the 19th century and virtually all made during the first half of the 20th century were mold blown resulting in mold seams; see the note below. To misquote an old saying as rephrased by the BLM supervisor that facilitated the initiation of this website project: There is also no neck ring mold seam immediately below the finish like found on most Owens machine produced bottles and on a majority of all machine-made bottles.
N otes on embossing, labeling, and existing research Raised embossing and when present, paper labeling on a bottle can frequently provide important details to refine the probable manufacturing date range if information exists for the company that either manufactured the bottle i.
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As Berge noted in referring to bottles, the "
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The chart accompanying this statement notes that bottles made before have a side mold seam ending on the shoulder or low on the neck, between and the seam ends just below the finish, between and the seam ends within the finish just below the finish rim top lip surfaceand those made after have mold seams ending right at the top surface of the finish, i.
These features are pointed out - and much more readable - on the larger hyperlinked image; click to view. As Berge noted in referring to bottles, the " This bottle is probably free-blown or dip molded. New Liquid Hydrogen Production in Texas Air Products will build a world-scale liquid hydrogen plant at its La Porte facility to meet increasing customer needs.
The following is a discussion of the most common exceptions to the side mold seam "rule" describing a few types of machine-made bottles on which the vertical side mold seams do not quite reach the top edge of the finish making them possible appear to be mouth-blown.