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Cheers and @Greenbank I suspected it was something like that but couldn't find anything definitive to back it up.
Cheers and @Greenbank I suspected it was something like that but couldn't find anything definitive to back it up.
I think early gas holders had a fixed storage container. Basically an upside down glass in a bowel of water. As the space under the glass has gas pumped in the glass rises. This requires a hole in the ground as deep as your glass is high when full.
Telescoping gas holders have a series of rings that fit inside each other so your gas holder can go a lot higher than the depth of your hole.
Sounds like they got upgraded.