3. Tones The most prevalent types of sounds are either low or high pitch. Words used by witnesses often succinctly and specifically denote the pitch. For example, the former might be approximated by a hummingbird, the latter likened to the squeal between stations on old-fashioned AM radios. Two revealing cases have recently come to light after being hidden for decades: At 4:00 a.m. on July 25, 1957, several workers were taking a break at the Daye Steel Plant in Huangshi City, Peoples Republic of China. Upon hearing a humming sound, they noticed a bright spot in the clear night sky that was increasing in apparent size. As it came closer, it was seen as a circular plate giving off a dazzling white light and leaving a white trail. During a two- to three-minute observation, it flew over the frightened observers at 1000 m., producing a whistling sound that was louder than a jet. As the object approached the witnesses, the low pitch changed to high pitch; no mention was made of any intermediate tones.7 The next example, collected by the CIA in southern Belgian Congo in 1952, remained secret until released in 1983 under a lawsuit pursuant to the Freedom of Information Act. Two fiery objects glided in sweeping curves over uranium mines. They were seen in several perspectives as disks, ovals, and thin lines. During 10 to 12 minutes of observation, they emitted hissing and buzzing sounds. Commander Pierre at a small airfield jumped into a fighter plane and took off in pursuit. He was able to get within 150 m. of the objects that were disk-shaped, aluminum, 12 to 15 m. in diameter, with a rim of fire. They were emitting a whistling sound that could easily be heard over the airplane engine. Note that the sound changed from low pitch to high pitch as the witness approached the objects, without mention of intermediate tones.8 In both cases, the range closed, with movement of the object in China and of the witness in the Congo. Explanation It has long been recognized that people can hear electromagnetic radiation in the microwave region, such as radar and microwave radiation from UFOs was suspected as the cause of humming sounds. Relatively little was known about this phenomenon 15 years ago, but it had been well established that the aural response was caused by short bursts of energy corresponding to pulsation of the microwave source. In some uncertain manner, the pulses stimulated the organ in the inner ear that sends signals to the brain. The tonal value perceived by experimental subjects corresponded to the pulse rage of the source. Also, the location of the source was usually thought to be behind the head as the direct response of microwave bypassed the time delay of ordinary, slow-moving sound waves reaching the more remote ear. This process, known as binaural audition, is one of several clues to recognizing the direction from which sounds originate. Vigorous research during the 1970s brought this highly complex phenomenon into sharp focus.9 But for the present purpose, many details must be omitted so some statements are James McCampbell 4 subject to various technical restrictions that are not mentioned. Generally speaking, it has been shown experimentally that people are able to hear pulsed microwaves from 200 to 3,000 MHz with peak power densities of 300 mW/cm2 and average power densities as low as 0.4 mW/cm2 with pulse widths of 1 to 100 microseconds (msec). As the shape of the response curve is a steep-sided mesa, the range of pulse width is probably about 10 to 40 msec. In terms of average power density, the threshold is approximately 120 mW/cm2. Therefore, very low-intensity, microwave radiation pulsed at 50 to 100 cycles per second would be “heard” and aptly described as humming. Experiments with animals showed that cats were 20 to 30% more sensitive than people, but one dog tested was 5 times more sensitive. That result may explain why agitated dogs are the first indication of many UFO events.
Posted on: Sat, 09 Nov 2013 22:06:31 +0000
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