How the Bird Swing Happens.

[rockbot]

corner seam line ending at shoulder.

 

[RED Matthews]

Hi, I thought I was writing a reply to you regarding the picture of the bottom of the bottle. All of a sudden it went away to somewhere. I must have pushed the wrong button. I was questioning this picture because it looks like there was a distribution of glass problem in that area. Is the glass on the upper side thick? The two upper corners of the glass looks different than the bottom corners. Of course it could just be the lighting.

Just curious.Thanks RED Matthews

 

[tigue710]

The partition was probably closed in the mold and then spun around before it was blown leaving the mold
Lines in the glass before it was blown out...

 

[tigue710]

For the record bird swings can happen in any blown bottle, hand or machine made. As the glass was blown instead Of one solid bubble of air in the glass the glass Pulled apart in one place and stretched out. Usually this stretch of glass broke and swung down and attached itself back to the same side of the bottle, making a little loop. Or it could of stayed intact making the classic, and rare bird swing. It's also possible that instead of just uneven distribution of air in the gather the gaffer could
Of inhaled on the the blow pipe sucking the gather back together so it stuck back to itself creating the bird swing when it was reblown out. Of course if the air made It back out the pipe it would of burned the gaffers lungs something mighty!

The only inconsistency if found with this is that you will not see evidence on the opposite side of the bottle from the bird swing...

 

[rockbot]

ORIGINAL: tigue710

The partition was probably closed in the mold and then spun around before it was blown leaving the mold
Lines in the glass before it was blown out...

Would that have been done by accident? Why does it continue up the neck and onto the lip?

Thanks.

 

[tigue710]

Yeah, it would have been accidental, could of been a malfunction with the machine, etc... This is only conjecture of course, but a more likely reason for the seam lines to be in the glass like that. The bottle would not have been able to be removed from the mold if it was blown that way, unless it was some strange 4 piece mold. Another thought is that some of the early machines dropped the gather from the part of the mold that formed the lip into the the part that formed the body, (these mds always have a seam line going up the neck to the lip, then around under the lip halfway, then over lip), and whe the gather was being inject through the lipping mold it picked up and carried the seam line through the gather into the bottle mold, leaving the seam in the glass as it stretched.