I sent it to Jörn directly. RCA made a 2nd order microphone at one point
http://www.coutant.org/bk10a/
Aaron
2010/12/20 Jörn Nettingsmeier <netti...@stackingdwarves.net>:
> it's cited in philip cotterel's thesis as the original source of the
> second-order gradient microphone. i can't believe it's not on the web,
> given its ripe old age.
> any pointers would be welcome. (and no, i didn't find it in the
> motherlode either.)
>
> thanks in advance,
>
> jörn
>
>
> --
> Jörn Nettingsmeier
> Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
>
> Meister für Veranstaltungstechnik (Bühne/Studio), Elektrofachkraft
> Audio and event engineer - Ambisonic surround recordings
>
> http://stackingdwarves.net
>
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