In the Continuous Casting process, molten metal is poured through a die of the desired outside profile. If an inner shape is also desired, the material may flow around a mandrel to create that profile. As the material flows through the water-cooled die, sufficient heat is extracted to solidify an outer shell.
In the comic strip, when the heroic Flash Gordon and his friends land on the fictional planet Mongo, they found it was ruled by an evil Emperor, a despot who quickly becomes their enemy. He was not named at first, only being known as the Emperor until several issues later when his name was revealed to be Ming.
He allows Zarkov to leave the city with Dale in hopes of following them. An angry Ming comes to the Secret Police command center and Klytus tells him he has located Dale, who is with Zarkov. Klytus tells an enraged Ming that Flash Gordon is still alive. He has suspicions of who might be responsible, but says he will need Ming's authority to pursue things the way he wants to.