 ... mark a point in the new direction ; then, the middle point between the two marks, with the point under the instrument, will define on the ground the trace of the vertical plane through Polaris at its eastern or western elongation, as the case may...  Magnetic Declination - Seite 66von Richard Urquhart Goode - 1899 - 392 SeitenVollansicht - Über dieses Buch
 | Maryland Geological Survey - 1897 - 622 Seiten
...quickly revolve the vernier plate 180°, repeat the observation, and as before mark a point in the new direction; then the middle point between the two marks,...eastern or western elongation, as the case may be. 7. By daylight lay off to the east or west, as the case may require, the proper azimuth taken from the... | |
 | Maryland Geological Survey - 1897 - 590 Seiten
...quickly revolve the vernier plate 180°, repeat the observation, and as before mark a point in the new direction; then the middle point between the two marks,...eastern or western elongation, as the case may be. 7. By daylight lay off to the east or west, as the case may require, the proper azimuth taken from the... | |
 | Maryland Geological Survey - 1897 - 590 Seiten
...quickly revolve the vernier plate 180°, repeat the observation, and as before mark a point in the new direction ; then the middle point between the two...eastern or western elongation, as the case may be. 7. By daylight lay off to the east or west, as the case may require, the proper azimuth taken from the... | |
 | Maryland Geological Survey - 1897 - 590 Seiten
...quickly revolve the vernier plate 180°, repeat the observation, and as before mark a point in the new direction; then the middle point between the two marks,...eastern or western elongation, as the case may be. 7. By daylight lay off to the east or west, as the case may require, the proper azimuth taken from the... | |
 | Fred Lavis - 1906 - 308 Seiten
...vernier plate 180°, again place the vertical hair upon the star, and, as before, mark a point in the new direction ; then the middle point between the two...eastern or western elongation, as the case may be. 7. By daylight lay off to the east or west, as the case may require, the proper azimuth taken from Table... | |
 | U.S. Coast and Geodetic Survey - 1909 - 136 Seiten
...plate 180°, again place the vertical hair upon the star, and, as l>efore, mark a point in the new direction; then the middle point between the two marks,...eastern or western elongation, as the case may be. 7. By daylight la}- off to the east or west, as the case may require, the proper azimuth taken from the... | |
 | Samuel Marx Barton - 1913 - 284 Seiten
...quickly revolve the vernier plate 180°, repeat the observation, and as before mark a point in the new direction ; then the middle point between the two...eastern or western elongation, as the case may be. 7. By daylight lay off to the east or west, as the case may require, the proper azimuth taken from Table... | |
 | Wilson Gardner Harger, Edmund Arnold Bonney - 1919 - 1020 Seiten
...vernier plate 180°, again place the vertical hair upon the star, and, as befpre, mark a point in the new direction; then the middle point between the two marks,...eastern or western elongation, as the case may be. " 7. By daylight lay off to the east or west, as the case may require, the proper azimuth taken from the... | |
 | 1922 - 38 Seiten
...point midway between the two marks, with the point under the instrument, will define on the ground the vertical plane through Polaris at its eastern or western elongation, as the case may be. Near elongation the azimuth of the star changes very slowly, not more than O'.l in the 10 minutes before... | |
 | Thomas Felix Hickerson - 1926 - 418 Seiten
...point midway between the two marks, with the point under the instrument, will define on the ground the vertical plane through Polaris at its eastern or western elongation, as the case may be. Near elongation the azimuth of the star changes very slowly, not more than 0.1' in the 10 minutes before... | |
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