Light Science for Leisure Hours, a Series of Familiar Essays on Scientific Subjects Natural Phenomena EtcLongmans, Green, and Company, 1871 - 316 páginas |
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Página 26
... says Arago , ' to imagine what could be the kind of change in the constitution of the globe which could act during one hundred and fifty - three years in gradually transferring the direction of the magnetic needle from due north to 23 ...
... says Arago , ' to imagine what could be the kind of change in the constitution of the globe which could act during one hundred and fifty - three years in gradually transferring the direction of the magnetic needle from due north to 23 ...
Página 36
... say that the spots cause the magnetic magnetic storms cause the spots . cause producing at once both sets of phenomena . There is as yet no certainty in this matter , but it seems as if philosophers would soon be able to trace in the ...
... say that the spots cause the magnetic magnetic storms cause the spots . cause producing at once both sets of phenomena . There is as yet no certainty in this matter , but it seems as if philosophers would soon be able to trace in the ...
Página 42
... say about our great terrestrial time - piece . One of the great charms of the science of astro- nomy is , that it enables men to predict . At such and such an hour , the astronomer is able to say , a celestial body will occupy such and ...
... say about our great terrestrial time - piece . One of the great charms of the science of astro- nomy is , that it enables men to predict . At such and such an hour , the astronomer is able to say , a celestial body will occupy such and ...
Página 43
... say : ' At such and such a long - past epoch , a given star or planet occupied such and such a position upon the celestial sphere . ' But how are they to verify such a statement ? It is clear that , in general , they cannot do so ...
... say : ' At such and such a long - past epoch , a given star or planet occupied such and such a position upon the celestial sphere . ' But how are they to verify such a statement ? It is clear that , in general , they cannot do so ...
Página 47
... say that his labours were thrown away . The explanation offered by him is indeed a just one , but it is insufficient . Properly esti- mated , it removes only half the difficulty which had perplexed mathematicians . It would be quite ...
... say that his labours were thrown away . The explanation offered by him is indeed a just one , but it is insufficient . Properly esti- mated , it removes only half the difficulty which had perplexed mathematicians . It would be quite ...
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