Re: When Did 16 2/3 rpm Records Become Obsolete?
The Collaro autochanger on Dad's circa 1956 radiogram has only 3 speeds. The similar circa 1959 version on my school's record player was 4 speed, but AFAIR, only LP's ( recordings of things like Shakespeare's plays) and 45's (at the school disco) were ever played on it. I too have never seen a 16 2/3 disc in the flesh, despite being a regular charity shop record browser.
Re language learning courses using records, it may be of interest to note that the American "International Correspondence Schools" were offering these by 1904, using the "Edison repeating phonograph" that also allowed the student to record his or her own efforts for assessment by the tutor. I don't suppose many of these can have survived today.
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