In response to my rant about the idiocy of measuring TV size by diagonal lengths rather than the more relevant total screen area, a reader wrote in to explain — and pose a challenge. Here, then, is the letter from Ralph Bahret:
In the first few decades of TV, pictures were created in round cathode ray tubes (CRT). The rectangular picture was projected on the round screen. The diameter of the CRT, which
approximates the diagonal of the picture, was used as the original measurement. Long after the demise of the round CRT, no better approach has replaced the diagonal picture measurement. Now that you understand TV measurement, do we have a volunteer to describe the evolution of a, b, c, etc. cups?
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