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from article Moving-target indication
Diagram of radar system with moving-target indication.
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from article Amplitude-modulation radio
An example of a low-frequency broadcast antenna. This three-tower array is connected to the Beidweiler long-wave transmitter (located in Beidweiler, Luxembourg), which broadcasts at a frequency of 234 kHz. Each tower is 290 m (951 ft) tall. (Photo…
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from article Magnetic observatory
Panoramic view of the San Juan, Puerto Rico geomagnetic observatory (foreground buildings) that is operated by the U.S. Geological Survey.
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from article Magnetic observatory
A typical magnetic sensor suite at an INTERMAGNET-standard observatory: (front) fluxgate variometer, (left) proton-precession magnetometer, (right) theodolite with small fluxgate attached to telescope.
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from article Magnetic observatory
Map showing the locations observatories that have been part of the INTERMAGNET consortium 1991–2011.
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from article Philosophy of science
Pulpit Rock Park in Colorado Springs, Colorado, photographed with camera equipment sensitive to infrared wavelengths of light outside of the visible portion of the electromagnetic spectrum that humans can perceive. The "invisible" light is rendered…
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from article Philosophy of science
Bust of the Greek polymath Aristotle. (Credit: Photos.com/Getty Images)
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from article Paleomagnetism
Field of an axial geocentric dipole. (After M. W. McElhinny, Palaeomagnetism and Plate Tectonics, Cambridge University Press, 1973)
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from article Paleomagnetism
Measuring head of the SQUID magnetometer (two-axis system).
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from article Paleomagnetism
Apparent polar wander path for North America for Late Carboniferous to recent time. The numbers represent time in millions of years before present. Circles represent one standard error about the mean. (After E. Irving, Paleopoles and paleolatitudes…
