 | Thomas Jefferson Lee - Astronomy - 1873 - 334 pages
...zenith-distances, simultaneous or not, under the assumption that the mean of a number of ob servations taken under favorable conditions will eliminate the...longer the distance the greater is the error caused by any uncertainty in the co-efficient, or in the actual refraction; conse quently there is a limit to... | |
 | U.S. Coast and Geodetic Survey - Triangulation - 1877 - 58 pages
...altitudes of which have been determined by the spirit-level; or, from reciprocal zenith distances, simultaneous or not, under the assumption that the...the same moment, at two stations a few miles apart. Snch a co-efficient may be established for the level of the sea, or for high elevations, or for lines... | |
 | Engineering - 1886 - 542 pages
...station. However, such elaboration is of doubtful utility and is seldom practiced. It is usual to assume that the mean of a number of observations, taken under...same moment, at two stations a few miles apart. The observations should be simultaneous or nearly so. Under these conditions the coefficients at the two... | |
 | Ira Osborn Baker - Leveling - 1887 - 168 pages
...station. However, such elaboration is of doubtful utility and is seldom practiced. It is usual to assume that the mean of a number of observations, taken under...same moment, at two stations a few miles apart. The observations should be simultaneous or nearly so. Under these conditions the coefficients at the two... | |
 | Ira Osborn Baker - Leveling - 1887 - 156 pages
...station. However, such elaboration is of doubtful utility and is seldom practiced. It is usual to assume that the mean of a number of observations, taken under...same moment, at two stations a few miles apart. The observations should be simultaneous or nearly so. Under these conditions the coefficients at the two... | |
 | Ira Osborn Baker - Leveling - 1887 - 162 pages
...squares, thus obtaining the values of each coefficient, or at least a coefficient for each station. 101 refraction which is found to exist, even at the same moment, at two stations a few miles apart. The observations should be simultaneous or nearly so. Under these conditions the coefficients at the two... | |
 | Herbert Michael Wilson - Camping - 1900 - 986 pages
...relative altitudes of which have been determined by the spiritlevel; or from reciprocal zenith distances, simultaneous or not, under the assumption that the...taken under favorable conditions will eliminate the differences of refraction found to exist even at the same moment at two stations a few miles apart.... | |
 | Herbert Michael Wilson - Camping - 1900 - 988 pages
...relative altitudes of which have been determined by the spiritlevel ; or from reciprocal zenith distances, simultaneous or not, under the assumption that the...taken under favorable conditions will eliminate the differences of refraction found to exist even at the same moment at two stations a few miles apart.... | |
 | Herbert Michael Wilson - Camping - 1900 - 964 pages
...relative altitudes of which have been determined by the spiritlevel; or from reciprocal zenith distances, simultaneous or not, under the assumption that the...taken under favorable conditions will eliminate the differences of refraction found to exist even at the same moment at two stations a few miles apart.... | |
 | Herbert Michael Wilson - Camping - 1912 - 1014 pages
...relative altitudes of which have been determined by the spiritlevel ; or from reciprocal zenith distances, simultaneous or not, under the assumption that the...taken under favorable conditions will eliminate the differences of refraction found to exist even at the same moment at two stations a few miles apart.... | |
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The coefficient of refraction or the proportion of intercepted arc is determined from the observed zenith distances to two stations, the relative altitudes of which have been determined by the spiritlevel; or from reciprocal zenith distances, simultaneous... 