View Full Version : old dr pepper bottle

09-20-2009, 09:22 PM
this is a 1972 dr pepper bottle that has a string of glass running through it
I would like to know if anybody has ever seen one like this?
What would it be worth?the bottle is very smooth on the out side
can't tell that there is anything wrong with the bottle...no dimples at all on the outside. How did this happen?


09-21-2009, 12:26 AM

Here's a link with several examples. I've got a grape juice bottle with one too. I'll post a pic tomorrow if I get around to it.

09-21-2009, 06:53 AM
thank you for the link to the other pics.looking forward to seeing more

RED Matthews
09-21-2009, 07:27 PM
Hello to you rblack and anyone else that is interested. The thing you have found in your bottle is in fact a birds-swing. Bird swings and bottom spikes are two dreaded defects that can occur in the manufacture of glass bottles. Bird-swings are really very dangerous happening item. The happen when ever the inside surfaces of the parison shape move close to each other - stick - and pull a strand of glass - when the parison is blown in the final mold. It is more prevelent in glass bottle making, where the neck centerline is not straight with the parison form. Early turtle ink wells and domed inkwells with a off-set neck were real cullprets because the bottle maker had to bend the parison so it could be enclosed in the final mold for the final blow. Another nightmare was the Avon duck bottle, where the parison had to turn quite a long distance from the neck of the bottle. This problem occured on the glass machines where the parison was formed in a blank mold upside down to the final mold and had to be inverted in its hot pliable soft condition. If the swing caused the parison to collapse enough for the inside surfaces to touch - it caused a birds swing. The inspectors and inspection machines that checked the completed bottles coming out of the annealing lehr - hopefully caught all of them.

The other defect I mentioned was a spike. This happened when the tip of the plunger go too hot and caused the glass to stick to it. As the plunger was pulled out of the press formed parison, it lifted a spike inside the jar parison and when it was blown in the final mold a glass spike was on the bottom of the jar. The IS-62 Emhart machine was a cullpret and I was involved with a lot of engineering to reduce this possibility. The advent of using some Eagle Brand oil can spouts for making the coolers that were inside the IS-62 plungers, was an outstanding success. It resulted in a problem when the cooing air pressure was increased and the oil can spouts split on their seams. We solved that problem by swagging steel tubes to the taper and these tubes became an important item that I sold when my company GLISCO Inc [Glass Industry Supply Company] started selling them to the worlds glass industry that needed them.

I am thinking I should put together a blog on my homepage, to expand on this aplication. RED Matthews

09-21-2009, 07:46 PM
I think you should have quite a few pictures for examples by now too! At least of the birdswings.

09-21-2009, 09:12 PM
Here's a ndnr coke with a birdswing.


09-21-2009, 09:13 PM
I picked up this bottle at a retired Knox glass employee estate sale.


09-22-2009, 12:04 AM
thanks for the reply Red.......Are the bottles worth anything?