 | Mary Somerville - 1834 - 484 pages
...between 156° 30' of west longitude, and 116° east. The needle is also subject to diurnal variations ; in our latitudes it moves slowly eastward during the...returns to its mean position about ten in the evening ; it then deviates to the westward, and again returns to its mean position about ten in the morning.... | |
 | Mary Somerville - 1834 - 390 pages
...between 156" 30' of west longitude, and 116° east. The needle is also subject to diurnal variations; in our latitudes it moves slowly eastward during the...returns to its mean position about ten in the evening; it then deviates to the westward, and again returns to its mean posi^on about ten in the morning. M.... | |
 | Mary Somerville - 1835 - 532 pages
...longitude. The needle is also subject to diurnal variations. In our latitudes it moves slowly westward during the forenoon, and returns to its mean position about ten in the evening ; it then deviates to the eastward, and again returns to its mean position about ten in the morning.... | |
 | Benjamin Silliman - 1837 - 118 pages
...west longitude, and 116° east. The needle is also subject to diurnal variations ; in our latir tudes it moves slowly eastward during the forenoon, and...returns to its mean position about ten in the evening ; it then deviates to the westward, and again returns to its mean position about ten in the morning.... | |
 | John Frederic Daniell - 1839 - 606 pages
...annual diminution of about 3' for the last fifty years. It is at present between 69° and 70°. § 395. The needle is also subject to diurnal variations of...increases generally from the equator to the poles. § 396. For a long time the only known means of estimating the intensity of the magnetic forces, was... | |
 | John Frederic Daniell - 1843 - 810 pages
...diminution of about 3' for the last fifty years. In 1822 it was observed by Col. Sabine to be 72°. § 403. The needle is also subject to diurnal variations of...doubtless depend upon diurnal changes of temperature. In addition to them, sudden disturbances of a large amount often affect the magnetic instruments, which... | |
 | Mary Somerville - 1846 - 496 pages
...subject to diurnal variations : in our latitudes the end that points to the north moves slowly westward during the forenoon, and returns to its mean position about ten in the evening; it then deviates to the eastward and again returns to its mean position about ten in the morning. M.... | |
 | Richard Dawes - 1849 - 228 pages
...America. The needle is also subject to a diurnal variation, which in our latitude moves slowly westward in the forenoon, and returns to its mean position about ten in the evening ; it then deviates to the eastward, and again returns to its mean position about ten in the morning."... | |
 | Archibald Tucker Ritchie - 1850 - 648 pages
...complicated " The needle is also suhject to diurnal variations. In our latitudes it moves slowly westward during the forenoon, and returns to its mean position about ten in the evening; it then deviates to the eastward, and again returns to its mean position about ten in the morning.... | |
 | William Allen Miller - 1855 - 456 pages
...very small amount: north of the magnetic equator the north end of the needle moves slowly eastward in the forenoon, and returns to its mean position about ten in the evening. These movements are dependent upon the diurnal variations of temperature. Connected with these alterations... | |
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The needle is also subject to diurnal variations ; in our latitudes it moves slowly eastward during the forenoon, and returns to its mean position about ten in the evening ; it then deviates to the westward, and again returns to its mean position about... 
