A New Principle of Sound Frequency Analysis (1932)
NASA Technical Reports Server (NTRS) · leaf 15
Fk.ukes 10 and 17.— Sound from a telephone receiver overexcited by a GO-cycle currenl, taken over a lower fre(iuency lauge to siiow response pattern in more detail
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
