SODAPOPBOB
Posts: 3678
Joined: 3/10/2010 Status: offline
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For those of you who already know all this stuff, please bare with me, as this is a work in progress. I said earlier I didn't want to get into a "mold seam" debate, and yet here I am right in the middle of one with myself. But it appears there is no other way to narrow down those early crowns without first understanding something about seams and scars. Hopefully this next article will be sufficient enough to get us back on track. Note: For me, the point being made here is that if we have bottles with suction scars, then our bottles are machine made ... thus, made during or sometime after "1905." Which would then confirm the "earliest" crown-top soda bottles as being produced between about 1897 and 1905. Which is close enough for me, and now all we have to do is find photos of those early crown bottles that don't have suction scars on them. Easy-smeasy ... right? Hopefully we'll find out soon. By the way, I just discovered that my Godfrey Archer bottle from England not only doesn't have suction scars, but that it was also made in a 3-piece mold. But I don't know yet when the 3-piece molds were last used. If I can determine that date, (another easy-smeasy) then I should be able to narrow down the date on my bottle even more. Thanks for hanging in there, SPB Owens machine suction scars A suction scar is the diagnostically distinctive mark most commonly found on the base of earlier bottles produced by the Owens Automatic Bottle Machine. The mark is a result of a mechanical blade or "knife" which cut off the glass being drawn upwards into the blank or parison mold via a suction process once enough glass was drawn to produce the desired bottle. Click Owens machine cycle to see an illustration of a portion of the Owens machine cycle (Stages 2 and 3) which shows schematically how the knife cuts off the glass. Suction scars are a more or less round, very fine line that is can be either incised into (typical) or raised above the glass surface. If the mold blade was dull or the base of the blank/parison mold worn or poorly fitting, the scar gets a "feathered" or "splotchy" edge to it, like shown in the picture above. The feathering is a result of the sliding or "smearing" action of the blade/knife and the rolling of slivers of glass in the narrow clearance between the blade, mold, and the drawn glass. The pictured bottle actually shows some of the smeared glass slivers imbedded into the bottle base adjacent to the suction scar itself. Suction scars are usually not perfectly centered, particularly on square and oval bottles, and will frequently slop over onto the heel and lower sides of non-round bottles. This latter features is particularly pronounced on smaller bottles.
< Message edited by SODAPOPBOB -- 4/19/2010 1:46:20 PM >
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