Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 84American Philosophical Society, 1941 |
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... north and , as a result , some time about 1450 the makers of compasses attached the cards to the magnets in such a way that true instead of magnetic direc- tions were indicated . A sound foundation for magnetic work at sea was laid in ...
... north and , as a result , some time about 1450 the makers of compasses attached the cards to the magnets in such a way that true instead of magnetic direc- tions were indicated . A sound foundation for magnetic work at sea was laid in ...
Сторінка 279
... north magnetic pole , visited in 1831 by Ross and in 1903 by Amundsen , is in Boothia Peninsula in north Canada ( latitude 70 ° 30 ' north , longitude 95 ° 30 ' west ) . The south magnetic pole , reached in 1909 by E. David , Douglas ...
... north magnetic pole , visited in 1831 by Ross and in 1903 by Amundsen , is in Boothia Peninsula in north Canada ( latitude 70 ° 30 ' north , longitude 95 ° 30 ' west ) . The south magnetic pole , reached in 1909 by E. David , Douglas ...
Сторінка 344
... north , and no reason at all why it should point anywhere else ; for there in the north was the invariable pole star , while elsewhere in the heavens all the other stars rose and set , continually changing their positions and their ...
... north , and no reason at all why it should point anywhere else ; for there in the north was the invariable pole star , while elsewhere in the heavens all the other stars rose and set , continually changing their positions and their ...
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Theoretical Synthesis of Supernova Spectra FRED | 1 |
Production of Secondary Electrons by Electrons of Energy | 7 |
Bache as an Educator MERLE M ODGERS | 161 |
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