The Cardboard Vax!

[sebo_fan]

Cardboard extension tubes? Good grief!

 

[rolls_rapide]

Yes, they were a combination of glue and cardboard type material, possibly mica might have been in the mix too. They were especially made to be lightweight and non-conductive, important in factories where overhead bus-bars are used carrying 400 odd volts.

 

[sebo_fan]

Ah I see! Good to know!

 

[kenkart]

Cardboard and Masonite vacs!

I have a late 40s Eureka built Montgomery Ward tank that is basically a cardboard tube covered in a leatherette material, the Filtex was a masonite board type material.