A New Principle of Sound Frequency Analysis (1932)
NASA Technical Reports Server (NTRS) · leaf 12
e pattern Rather surprising, however, is the fact that the fourth in more detail. and the fifth harmonics are predominant, whereas the Figures 18 and 19 show the resolved sound issuing sixth is much smaller. By applying Fourier analysis to from a small 6-bladed propeller driven by a motor. The the… … Figure 10.— The photographic recording device mechanically interconnected with the beat-frequency oscillator DISCUSSION REGARDING THE OPERATING CHARAC- was in the first case 5,400 revolutions per minute and TERISTICS OF THE NEW ANALYZER in the second case 3,000. Note that the fundamental The…
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
![An illustration from [Catalog]. (1908)](https://img.insideoutlibrary.com/img/200/ia-catalog00macy-292-885.webp)
