Text: "Professor Gavraud is an engineer who almost gave up his post at an institute in Marseilles because he always felt ill at work. He decided against leaving when discovered that the recurrent attacks of nausea only worried him when he was in his office at the top of the building. Thinking that there must be something in the room that disturbed him, he tried to track it down with devices sensitive to various chemicals, and even with a geiger counter, but he found nothing until one day, nonplused, he leaned back against the wall. The whole room was vibrating at a very low frequency. The source of this energy turned out to be an air-conditioned plant on the roof of a building across the wy, and his office was the right shape and the right distance from the machine to resonate in sympathy with it. I was this rhythm, at seven cycles per second, that made him sick." "Fascinated by the phenomenon, Gavraud decided to build machines to produce infrasound so that he could investigate it further. In casting around for likely designs, he discovered that the whistle with a pea in it issued to all French gendarmes produced a whole range of low-frequency sounds. So he produced a police whistle six feet long and powered it with compressed air. The technician who gave the giant whistle its first trial blast fell down dead on the spot. A post-mortem revealed that all his internal organs had been mashed into an amorphous jelly by the vibrations." "Gavraud went ahead with his work more carefully and did the next test out of doors, with all observers screened from the machine in a concrete bunker. When all was ready, they turned the air on slowly - and broke the windows of every building within half a mile of the test site. Later they learned to control the amplitude of the infrasound generator more effectively and designed a series of smaller machines for experimental work. One of the most intersting discoveries to date is that the waves of low frequencu can be aimed and that two generators focused on a particular point even five miles away produce a resonance that can knock a building down as effectively as a major earthquake. These frequency-7 machines can be built very cheaply, and plans for them are available for three French francs from the Paten Office in Paris." - Supernature pp. 92-93, Coronet Books 1974.

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