 | Israel Charles White - 1904 - 652 Seiten
...years as accurate by the railroad officials, civil engineers, and others, have been proven erroneous, often to the extent of several feet. In this readjustment of elevations, the II. SG Survey finds it necessary to change slightly, as a higher degree of accuracy is attained, some... | |
 | West Virginia Geological and Economic Survey, Ray Vernon Hennen - 1909 - 712 Seiten
...been proven erroneous, often to the extent of several feet. In this readjustment of elevations, th USG Survey finds it necessary to change slightly,...railroad, civil, and mining engineers are now almost unversally adjusting their levels to those given by the USG Survey, especially since the recent plan... | |
 | West Virginia Geological and Economic Survey, Ray Vernon Hennen - 1909 - 702 Seiten
...years as accurate by the railroad officials, civil engineers, and others, have been proven erroneous, often to the extent of several feet. In this readjustment of elevations, th USG Survey finds it necessary to change slightly, as a higher degree of accuracy is attained, some... | |
 | West Virginia Geological and Economic Survey, George Perry Grimsley - 1910 - 436 Seiten
...proven erroneous, often to the extent of several feet. In this readjustment of elevations the US Geol. Survey finds it necessary to change slightly, as a...same bench mark for one year may differ slightly from those given in a later publication. The railroad, civil and mining engineers, are now almost universally... | |
 | West Virginia Geological and Economic Survey, Charles E. Krebs - 1911 - 492 Seiten
...years as accurate by the railroad officials, civil engineers, and others, have been proven erroneous, often, to the extent of several feet. In this readjustment of elevations the United States Geological Survey finds it necessary to change slightly, as a higher degree of accuracy... | |
 | 1909 - 764 Seiten
...years as accurate by the railroad officials, civil engineers, and others, have been proven erroneous, often to the extent of several feet. In this readjustment of elevations, th USG Survey finds it necessary to change slightly, as a higher degree of accuracy is attained, some... | |
| |
As the result of precise leveling, many of the old levels and bench marks accepted for many years as accurate by the railroad officials, civil engineers, and others, have been proven erroneous, often to the extent of several feet. In this readjustment... 