This material is discussed in:
Harvey Fletcher's role in the creation of communication acoustics
J. Acoust. Soc. Am., 1996, April, Vol. 99, pp 1825--1839.

This 28 minute video proceeds as follows (some excerpts are truncated):

Part1

1. Introduction (00:06)
2. Short story about coyote (00:32)
3. Millikan and the Oil drop experiment (01:35)

   Part2

4. Acoustics (7:49)
5. Audiometry and Alfred DuPont's desk size $5000 hearing aid (9:27)

   Part3

6. Stereo, orthotelephonic response, and phonograph (11:20)
7. Three channel sound presentation (14:15)
8. Three channel sound on film (18:20)

   Part4

9. The critical band theory and loudness (19:15)

   Part5

10. Musical acoustics and the inharmonic structure of a Piano (22:45)

    Part6

11. Retirement (25:54)
12. Final words and credits (27:30). Date of video is 1949+14 years, namely 1963

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