 | Robert Gibson - Surveying - 1806 - 486 pages
...to the sine of the sun's declination, So is radius To the sine of the true amplitude. Then if both amplitudes be north, or both south, their difference...and the other south, their sum is the variation. To know whether the variation be easterly or westerly. magnetical one, the variation is easterly, but... | |
 | Robert Gibson - 1808 - 482 pages
...to the sine of the sun's declination, So is radius To the sine of the true amplitude. Then if both amplitudes be north or both south, their difference is the variation, but if one be north and the othes south, their sum is the variation. To know whether the variation be easterly or westerly. Let... | |
 | Robert Gibson - Surveying - 1811 - 580 pages
...true and magnetic amplitudes, be both north or both south, their difference is the variation ; but it one be north and the other south, their sum is the variation ; and to know whether it be easterly or westerly, suppose the observer looking towards that point of... | |
 | Robert Gibson - Surveying - 1814 - 558 pages
...north or south, according to the declination. 2. Then if the true and magnetic amplitudes, be brfth north or both south, their difference is the variation...north and the other south, their sum is the variation ; and to know whether it be easterly or westerly, suppose the observer looking towards that point of... | |
 | Surveying - 1814 - 402 pages
...true and magnetic amplitudes, be both north, or both south, their difference is the variation ; Hut if one be north and the other south, their sum is the variation ; and to know whether it be easterly or westerly, suppose the observer looking towards that point of... | |
 | Robert Gibson - Surveying - 1821 - 594 pages
...the north or south according to the declination. 2. Then if the true and magnetic amplitudes, be both north or both south, their difference is the variation...north and the other south, their sum is the variation ; and to know whether it be easterly or westerly, suppose the observer looking to wards that point... | |
 | Nautical astronomy - 1821 - 708 pages
...otherwise west. If the observed and true amplitudes be both north or both south, their difference will be the variation ; but if one be north and the other south, their sum will be the variation. If the true and observed azimuths be both east or both west, their differ»nce... | |
 | Edward Riddle - Nautical astronomy - 1824 - 572 pages
...the computed amplitude and that by the compass be both north or both south, their difference will be the variation ; but if one be north and the other south, their sum will be the variation, easterly when the true amplitude is to the right, and westerly when it is to... | |
 | Thomas Kerigan - Nautical astronomy - 1828 - 776 pages
...if the true amplitude, thus found, and the magnetic amplitude, observed per azimuth compass, be both north or both south, their difference is the variation...north and the other south, their sum is the variation : — and to know whether it be east or west, let the observer look directly towards that point of... | |
 | Thomas Kerigan - Nautical astronomy - 1838 - 804 pages
...if the true amplitude, thus found, and the magnetic amplitude, observed per azimuth compass, be both north or both south, their difference is the variation...north and the other south, their sum is the variation : — and to know whether it be east or west, let the observer look directly towards that point of... | |
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Then if the true and magnetic amplitudes, be both north or both south, their difference is the variation ; but if one be north and the other south, their sum is the variation ; and to know whether it be easterly or westerly, suppose the observer looking... 
