The metal band around the CRT is more than a means to secure the four corner mounting lugs. It is an implosion resisting band applied and tensioned by the CRT manufacturer to many hundreds of pounds of tension. It applies an inwards force especially at the four outer corners of the glass where the front plate meets with the funnel section. This force puts some weak spots in compression, an advantage since glass is stronger in compression rather than extension. It makes an implosion less likely, and in the event of one reduces the velocity of many of the fragments.

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