By Sir John Frederick William Herschel
This Elibron Classics e-book is a facsimile reprint of a 1833 variation through Longman, Rees, Orme, Brown, eco-friendly, & Longmans; and John Taylor, London. the cupboard Cyclopaedia.
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Extra resources for A treatise on astronomy
Higgins. In 1946, Kerr and Shain explored the possibility of obtaining radar echoes from meteors, following the auroral experiments of DeWitt and Bay were, studies carried out in the in essence, 55. Hellgren and Meos, "Localization of Aurorae with 10m High Power Radar Technique, using a Rotating Antenna," Tellus 3 (1952): 249-261; Harang and Landmark, "Radio Echoes Observed during Aurorae and Geomagnetic Storms using 35 and 74 Mc/s Waves Simultaneously," Journal of Atmospheric and Terrestrial Physics 4 (1954): 322-338; ibidem Nature 171 (1953): 1017-1018; Harang and J.
When Prentice spotted a meteor, he shouted. His sightings usually, though not always, correlated with an echo on the radar screen. Lovell thought that the radar echoes that did not correlate with Prentice's sightings might have been ionization trails created by cosmic ray showers. He did not believe, initially, that the radar might be detecting meteors too small to be seen by the human eye. The next opportunity for a radar study of meteors came on the night of 9 October 1946, when the Earth crossed the orbit of the Giacobini-Zinner comet.
Villard, Jr. Villard had earned his engineering degree during the war for the design of an ionosphere sounder. As an amateur radio operator in Cambridge, Massachusetts, he had noted the interference caused by meteor ionizations at shortwave 48 frequencies called Doppler whistles. In October 1946, during the Giacobinid meteor shower, Helliwell, Villard, Laurence A. Manning, and W. E. , detected meteor ion trails by listening for Doppler whistles with radios operating at 15 MHz (20 meters) and 29 MHz (10 meters).