Rubber Crystal is name E.T. Wright gave to their tubular cold blast globes. Tough as rubber, clear as crystal. I can vouch for the crystal part of the name, but the rubber claim I don’t feel like testing out. The name appears to have started just before the 1900s, and carried right through until the late 1920s, or even until E.T. Wright closed. Every cold blast E.T. Wright sold had one of these globes, plus they also sold the globes wholesale as replacement globes a person could buy without a lantern. As such, it’s common to find these globes in non E.T. Wright lanterns too.
Rubber Crystal Globes have a rather unique shape for cold blast globes, a rather fat looking shape, and a lip at the top, much like a No.0 hot blast globe. This unique designcertainly stands out against other cold blast globes.