FLY Posted March 15 Posted March 15 Was just on BCUSA and was reading about bullroarers. Seems to me it would be good for attracting bigfoot
Patterson-Gimlin Posted March 15 Posted March 15 They sound quite annoying. Perhaps, a better way to attract forest giants would be experimenting with different levels of infrasound.
FLY Posted March 15 Author Posted March 15 40 minutes ago, Patterson-Gimlin said: They sound quite annoying. Perhaps, a better way to attract forest giants would be experimenting with different levels of infrasound. Bullroarer It makes a characteristic roaring vibrato sound with notable sound modulations occurring from the rotation of the roarer along its longitudinal axis, and the choice of whether a shorter or longer length of cord is used to spin the bullroarer. By modifying the expansiveness of its circuit and the speed given it, and by changing the plane in which the bullroarer is whirled from horizontal to vertical or vice versa, the modulation of the sound produced can be controlled, making the coding of information possible. The low-frequency component of the sound travels extremely long distances, clearly audible over many miles on a quiet night Infrasound, sometimes referred to as low frequency sound or incorrectly subsonic (subsonic being a descriptor for "less than the speed of sound"),[1] describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz, as defined by the ANSI/ASA S1.1-2013 standard).[2] Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. Although the ear is the primary organ for sensing low sound, at higher intensities it is possible to feel infrasound vibrations in various parts of the body. Both are low frequency sounds.
Patterson-Gimlin Posted March 16 Posted March 16 I appreciate the very detailed explanation. I have never heard of studies with bullroarers. I understand what you are saying about infrasound at 20 Hz. 17 Hz according to Recent studies have received call backs in an area where non human primate hair was discovered in a cave.
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