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Why does Dr. Bob sign off, “I’m Dr. Bob Peters and that’s thirty”?

Posted/updated on: September 15, 2015 at 5:58 am
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In the days of linotype machines for setting type, multiple pages of copy contained the footer “-more-” at bottom of each page. The end of the copy on the last page carried the footer “-30-“. That told the typesetter in a definitive fashion that he had reached the end of his copy. Why “30”? No one I have ever asked knows. But the designation “30” has stuck as an indication of “the end”. Dr. Bob adopted this convention years ago when he was a neophyte broadcaster.


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