Bulletin - United States Geological Survey, Ausgabe 288

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The Survey., 1906
 

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Seite 49 - Quadrangles. The elevations in the following list are based upon an aluminum tablet at the southeast corner of the Jefferson County Court House at Steubenville, Ohio, marked "716 STEUBENVILLE. ' ' The elevation of this is accepted as 714.729 feet above mean sea level and was determined from the Army Engineers bench mark "67 A...
Seite 6 - ... feet. This method of numbering bench marks has been adopted where many levelmen are working in the same area at the same time, as less liable to lead to confusion in identification of bench marks than any attempt at serial numbering, and becanse the bench mark number at the same time gives an approximate statement of the elevation.
Seite 28 - QUADRANGLES. The elevations in the following list are based upon various bench marks of the transcontinental precise-level line of the United States Coast and Geodetic Survey and accord with the latest adjustment. They are referred to an aluminum tablet in the State Library at Harrisburg, stamped "364 HARRISBURG 1899...
Seite 5 - ... to correct errors and make the line continuously good throughout. The latter or primary levels are determined with the Y level, precautions being taken against only the principal errors and the levels being run mostly in circuits of single lines. The allowable limit of error observed on the precise work already done by the Geological Survey in this State is represented in feet by 0.02 times the square root of D, and that for the primary...
Seite 64 - Gannett. 1901. 51 pp. 185. Results of spirit leveling, fiscal year 1900-1901, by HM Wilson, JH Renshawe, EM Douglas, and RU Goode. 1901. 219 pp. 187. Geographic dictionary of Alaska, by Marcus Baker. 1901.
Seite 35 - Hamilton, 60 feet west of, 5 feet south of track, in top of large rock, aluminum tablet stamped "1188 PITTSBURG," 1,187.015 Loop, 0.25 mile west of, high bridge over Mahoning Creek, in south end of east abutment; aluminum tablet stamped "1183 PITTS.,"...
Seite 40 - Goodville, crossing at station; top of rail '1,215 Dayton, 900 feet west of station, northwest wing wall of Buffalo, Rochester and Pittsburg Railroad bridge over small stream, on second coping stone; aluminum tablet stamped "1326 PITTSBURG...
Seite 17 - The elevations in the following list are the result of a line of precise levels run from Binghampton to Poughkeepsie.
Seite 63 - Gannett. 1894. 67 pp. 118. Geographic dictionary of New Jersey, by Henry Gannett. 1894. 131 pp. 122. Results of primary triangulation, by Henry Gannett. 1894.
Seite 5 - ... stem cemented into a drill hole, generally in the vertical walls of public buildings, bridge abutments, or other substantial masonry structures. The second form, employed where masonry or rock is not accessible, consists of a hollow wrought-iron post...

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