Concern #step three : Is the bottle cylindrical/round, exhibiting very symmetrical conformation, and with the body and/or neck having faint concentric “rings” or striations on the glass surface going horizontally around the body of the bottle as shown in the picture below?
The brand new concentric bands are not usually since noticeable while the photo reveals (simply click in order to build) and sometimes perhaps not apparent, whether or not in the event the expose it’s a conclusive diagnostic function.
Yes – This bottle was produced in a turn-mold which was also known in the glass industry as a paste-mold. All turn-mold bottles are cylindrical and unless stained, will usually have a polished looking sheen to the glass surface. The large majority of turn-mold bottles date between 1880 and 1915, though they were produced as early as the mid-1850s and as late as the early 1920s (Switzer 1974; Deiss 1981; Jones & Sullivan 1989; Boow 1991; Gerth 2006; empirical observations).
A beneficial “YES” cure for this real question is apt to be than simply a great “Zero”. See Concern #5 to own a prospective matchmaking refinement in accordance with the form of end up application, though some of your own symptomatic has are going to be masked of the turn-shape design processes. For more information on change/insert mildew package consult the newest Container Muscles Functions & Mildew and mold Seams page.
NO – The bottle is either not cylindrical, or if so, is very crudely made and non-symmetrical exhibiting no concentric body/neck rings. This bottle is mouth-blown and likely either free-blown or dip molded. These two manufacturing types can be hard to differentiate from each other, though free-blown bottles are usually cylindrical or oval in cross-section and have lines that are not sharp (i.e., a “flowing” look). Most free-blown bottle date prior to the 1850s though can be much older as this method was used at least as early as Roman times. Dip mold produced bottles are either cylindrical, square or rectangular in the body but usually have more distinct lines from the lower shoulder down since most if not all of the body was actually molded (Jones & Sullivan 1989). Dip mold bottles usually date prior to 1865-1870 but can also be much older (back to early 18th century at least).
A user may move to Concern #cuatro for one additional dating attribute based on pontil scars, though all these datable attributes (free-blown, dip mold, and pontil scars) overlap significantly. Consult Bottle Body Characteristics & Mold Seams page for more information on and images of these type bottles.
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