 The former are determined by lines of levels run either in both forward and backward directions or by simultaneous double-rodded lines, a highgrade instrument being used and special precautions being taken in observations and reduction to correct errors...  Bulletin - Page 61910Full view - About this book
 | Geology - 1918 - 226 pages
...according to the methods employed in their determination. The former are determined by lines of levels run either in both forward and backward directions...simultaneous double-rodded lines, a • high-grade instrument being used and special precautions being taken in observations and reduction to correct... | |
 | Samuel Stinson Gannett, David Henry Baldwin - Pennsylvania - 1906 - 992 pages
...accuracy of their determination, precise and primary. The former are determined by lines of levels run either in both forward and backward directions...by simultaneous double-rodded lines, a high-grade instrument being used and special precautions being taken in observations and reduction to correct... | |
 | Pennsylvania. Topographic and Geological Survey Commission - Pennsylvania - 1906 - 328 pages
...accuracy of their determination, precise and primary. The former are detcrmincd by lines of levels run either in both forward and backward directions...by simultaneous double-rodded lines, a high-grade instrument being used and special precantions being taken in observations and reductions to correct... | |
 | Pennsylvania. Topographic and Geological Survey Commission - 1906 - 328 pages
...accuracy of their determination, precise and primary. The former are determined by lines of levels run either in both forward and backward directions...by simultaneous double-rodded lines, a high-grade instrument being used and special precantions being taken in observations and reductions to correct... | |
 | Geological Survey (U.S.) - Geology - 1906 - 72 pages
...accuracy of their determination, precise and primary. The former are determined by lines of levels run either in both forward and backward directions...by simultaneous double-rodded lines, a high-grade instrument being used and special preeautions being taken in observations and reduction to correct... | |
 | Samuel Stanson Gannett, David Henry Baldwin - California - 1908 - 306 pages
...the supervision of Mr. SS Gannett, geographer in charge of the triangulation and computing section. The lists are separated into two classes, precise...of refinement in the method of leveling employed. The elevations under precise leveling were determined by lines run either in both forward and backward... | |
 | Geological Survey (U.S.) - Geology - 1908 - 210 pages
...the supervision of Mr. SS Gannett, geographer in charge of the triangulation and computing section. The lists are separated into two classes, precise...of refinement in the method of leveling employed. The elevations under precise leveling were determined by lines run either in both forward and backward... | |
 | Geology - 1908 - 458 pages
...accuracy of their determination, precise and primary. The former are determined by lines of levels run either in both forward and backward directions...by simultaneous double-rodded lines, a high-grade instrument being used and special precautions being taken in observations and reductions to correct... | |
 | Pennsylvania. Topographic and Geological Survey Commission - Pennsylvania - 1908 - 452 pages
...accuracy of their determination, precise and primary. The former are determined by lines of levels run either in both forward and backward directions...by simultaneous double-rodded lines, a high-grade instrument being used and special precautions being taken in observations and reductions to correct... | |
 | Geological Survey (U.S.) - Geology - 1910 - 72 pages
...geographer, and since 1907 under the general direction of EM Douglas, geographer. Classification. — The lists are separated into two classes, precise...under precise leveling were determined by lines run in both forward and backward directions, a high-grade level and rated rods being used and special precautions... | |
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