 | INSTRUCTIONS TO THE SURVEYORS GENERAL OF PUBLIC LANDS OF THE UNITED STATES. - 1871 - 106 σελίδες
...with a candle or lain]) upon it, be placed at a distance of thirty or forty yards from the plumb-line, and in the same direction with it and the compass-sight....Now, if the elongation at the time of observation was west, and the north end of the needle is on the west side of the line, the azimuth, plus the angle... | |
 | J. H. Hawes - 1873 - 234 σελίδες
...thirty or forty yards from the plumb-line, and in the same direction with it and the compass- sight. The line so determined makes, with the true meridian, an angle equal to the azimuth of the polestar; and from this line the variation of the needle is readily determined, even without tracing... | |
 | United States. General Land Office - 1881 - 138 σελίδες
...thirty or forty yards from the plumb line, and in the same direction with it and the compass sight. The line so determined makes, with the true meridian,...Now, if the elongation at the time of observation was west, and the north end of the needle is on the west side of the line, the azimuth, plus the an;... | |
 | Charles Davies - 1883 - 578 σελίδες
...reference, by driving pegs deeply into the ground and marking the exact point on each by a small nail. The line so determined, makes, with the true meridian, an angle equal to the azimuth of the pole.star; and, from this line, the variation of the needle is readily determined, even without tracing... | |
 | United States. Bureau of Land Management - 1890 - 192 σελίδες
...thirty or forty yards from the plumb line, and in the same direction with it and the compass sight. The line so determined makes, with the true meridian, an angle equal to the azimuth of the pole-star; and from this line the variation of the needle is readily determined, even without tracing... | |
 | Edwin Alvin Root - 1902 - 458 σελίδες
...assistant. The line passing through the tack a under the instrument and the tack b set in the forward stake makes with the true meridian an angle equal to the azimuth of the North Star at elongation. Now multiply the natural tangent of the azimuth by the distance between the... | |
| |
The line so determined makes, with the true meridian, an angle equal to the azimuth of the pole star; and from this line the variation of the needle is readily determined, even without tracing the true meridian on the ground. Place the compass upon this... 