Mineral Resources of Alaska: Report on Progress of Investigations in 1910

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U.S. Government Printing Office, 1911 - 333 Seiten
 

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Seite 6 - I), 3£ inches in diameter and one-fourth inch thick, having a 3-inch stem, which is cemented in a drill hole in solid rock in the wall of some public building, a bridge abutment, or other substantial masonry structure. The second form (F, PI.
Seite 8 - ... datum may so change some of the figures that the original markings are 1 or 2 feet in error. It is assumed that engineers and others who have occasion to use the bench-mark elevations will apply to the Director of the United States Geological Survey at Washington, DC, for the adjusted values, and will use the markings as identification numbers only. Datum. — All...
Seite 5 - Herron, geographer, under the general direction of RB Marshall, chief geographer. The names of the various levelmen are given in the introduction to each list. The office work of computation, adjustment, and preparation of lists was done mainly by SS Gannett, geographer, and DH Baldwin, topographer, and since 1907 under the general direction of EM Douglas, geographer.
Seite 331 - Reconnaissances in the Cape Nome and Norton Bay regions, Alaska, in 1900,
Seite 7 - The office adjustment of the notes and the reduction to mean sealevel datum may so change some of the figures that the original markings are 1 or 2 feet in error. It is assumed that engineers and others who have occasion to use the bench-mark elevations will apply to the Director of the United States Geological Survey...
Seite 330 - Yukon pfacer fields, by LM Prindle. In Bulletin 284, 1906, pp. 109-131. Reconnaissance from Circle to Fort Hamlin, by RW Stone. In Bulletin 284, 1906, pp. 128-131. The Yukon-Tanana region, Alaska; description of the Circle quadrangle, by LM Prindle. Bulletin 295, 1906, 27 pp.
Seite 8 - Mexico, or the Pacific Ocean. . The connection with tidal stations for bench marks in certain areas that lie at some distance from the seacoast is still uncertain, and this fact is indicated by the addition of a letter or word to the right of the word " Datum
Seite 8 - Mean sea level is the average height of the water, all stages of the tide being considered. It is determined from observations made by means of tidal gages placed at stations where local conditions, such as long, narrow bays, rivers, and like features will not affect the height of the water. To obtain even approximately correct results, these observations must extend over at least one lunar month, and if accuracy is desired they must extend over several years.
Seite 7 - Baldwin, topographer, and since 1907 under the general direction of EM Douglas, geographer. Classification. — The elevations are classified as precise or primary, according to the methods employed in their determination.
Seite 70 - Smith, PS Geology and mineral resources of the Solomon and Casadepaga quadrangles, Seward Peninsula, Alaska.

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