Nikola Tesla Books
12 - Dr. Donn's microbarographs record microscopic variations in barometric pressure, such as those generated by distant nuclear explosions. The pattern or "signature" of the offshore blasts bears no resemblance to such explosions, he said yesterday in a telephone interview. It is clear that the occurrences were high in the atmosphere. They were not close enough to the ocean surface to generate seismic waves through the sea and through the earth's crust. Seismic stations in North Carolina and New England recorded the effect, but only at travel times characteristic of the atmosphere. That is, they responded to an effect of atmosphere pressure waves on the earth in the immediate vicinity of each station. of the 25 such stations operated by the Western Observatory of Boston College, six, in southern New England, have sensed the blasts. In each case, according to Dr. Edward Chiburis of that observatory, the first record was made by a station near Danbury, Conn., being the one closest to a source area off South Jersey coast. Some events were observed as early as last July. They are definitely not a natural phenomenon, he said yesterday. He "just cannot imagine" any explanation other than sonic booms. Sensitive equipment set up in California to measure the low-frequency, low-level variations in the earth's magnetic field, recorded some very local changes in that field which coincided with the establishment of the standing wave off the Pacific coast. This anomaly appears to be very localized and allowing for the limitations of the accuracy of measurement of the equipment used, it was estimated to be in the region of 40 miles in diameter. The measurements cannot be independently verified, which means that the results reported must be treated with some caution. However, it is interesting to observe that there is a well known very localized gravity anomaly at this Palmdale, California location. Whether there is any connection between the two phenomenon has not been established but again the magnetic observations are not inconsistent with the Tesla theories. Measurements of the earth's magnetic field have revealed that it has a superimposed modulation at very lowfrequency.
