The Weird Machine That Measured Radio Audiences in the ’30s and ’40s

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In the early days of radio broadcasting, there was no easy way to tell how many people were listening to the soap operas and prestige crime dramas, and, subsequently, how many were actually hearing the radio ads for tooth powder and name brand coal for your furnaceinformation that advertisers desperately wanted.

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https://paleofuture.gizmodo.com/the-weird-machine-that-measured-radio-audiences-in-the-1633851253