Quote:
Originally Posted by WISCOJIM
Your premise that the front glass is thick to handle the vacuum is false. If thick glass were needed, the rest of the CRT including the neck would also have to be thick.
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Note quite right. The bell, being more arched, can withstand greater compressive force for a given thickness. The faceplate, being flatter, is compressed by the band to make sure that the stress is compressive even in the center, but that means that the compressive stress is even greater at the periphery. If the tube were a sphere, the stress would be equal and compressive everywhere rather than being stronger some places so that the places where it is minimum never become tensile, even with some impact force.