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I just went to the library to check out the film loop of the Doppler =
effect in a ripple tank that I use every year, and found that they ha=
ve discarded it since I used it last (without even offering to donate=
it to our department instead!). Does anyone know if this film (poss=
ibly produced by Bell Labs?) is available in DVD (or maybe even VHS) =
format? (The original version is probably from the 1970's or before.=
)