Both early mantles and this pictured piece. The pictured piece is a coarse cotton weave.
Egyptian cotton at one time for Coleman if recalled correctly.
Treatments varied. With earlier thorium discontinued in America due to mild radioactivity.
Yttrium replaced thorium. less bright but so be it.
The reason being cotton was/is used is to support the coating until fired.
The ask resulting is what glows after. So the cotton had burned away leaving the fragile ash .
When Coleman went to cheaper cotton , (post Silklite mantles) the quality of mantles began to fall off. Till current new mantles often failing prematurely. Evan at light up. And hole blown in a mantle lets a hot jet of heat go toward wherever the hole is facing. We don't want that...
Ther globe that is glass today was mica in early lanterns. that protected/protects the mantles from wind and flying insects. Screen has been used in place.