Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 84American Philosophical Society, 1941 |
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Сторінка 239
American Philosophical Society. GEOMAGNETIC OBSERVATORIES AND INSTRUMENTS H. E. MCCOMB Chief , Section of Observatories and ... observatory in the United States was erected at Girard College , Philadelphia , in 1838 under the direction of ...
American Philosophical Society. GEOMAGNETIC OBSERVATORIES AND INSTRUMENTS H. E. MCCOMB Chief , Section of Observatories and ... observatory in the United States was erected at Girard College , Philadelphia , in 1838 under the direction of ...
Сторінка 245
... observatory was maintained until 1881 . For various periods between 1860 and 1883 observatories equipped with eye - reading instruments were operated inter- mittently at Eastport , Maine ; Portland , Maine ; Washington , D. C .; Point ...
... observatory was maintained until 1881 . For various periods between 1860 and 1883 observatories equipped with eye - reading instruments were operated inter- mittently at Eastport , Maine ; Portland , Maine ; Washington , D. C .; Point ...
Сторінка 247
... observatories , considerable attention is to the matter of insulation against temperature changes as Variation Magnetic Observatory and Office Floor Plan Office MAGNETIC OBSERVATORY. G. 8. Aerial view of Huancayo magnetic observatory ...
... observatories , considerable attention is to the matter of insulation against temperature changes as Variation Magnetic Observatory and Office Floor Plan Office MAGNETIC OBSERVATORY. G. 8. Aerial view of Huancayo magnetic observatory ...
Зміст
Theoretical Synthesis of Supernova Spectra FRED | 1 |
July 30 1941 No | 5 |
Production of Secondary Electrons by Electrons of Energy | 33 |
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