File:Annual report of the United States Geological Survey to the Secretary of the Interior (1895) (14594623528).jpg

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Identifier: annualreportofun1711geol (find matches)
Title: Annual report of the United States Geological Survey to the Secretary of the Interior
Year: 1880 (1880s)
Authors: Geological Survey (U.S.)
Subjects: Geological Survey (U.S.) Geology Water-supply Forest reserves Mines and mineral resources
Publisher: Washington : G.P.O.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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\ DIAGRAMS OF REDUCTIONS, BY STA(
Text Appearing After Image:
GANNETT. J SECULAR VARIATION. 303 CHARACTERISTICS OF SECULAR VARIATION. This table and the diagrams develop a number of peculiar features,to which attention may profitably be called. In the first place, mostof the irregularities in the curves do not appear to be persistent indifferent States, showing that they are in all probability due to delectsof observation. The flattening of the curve in New England and inother Northeastern States, when contrasted with its course in otherNorthern States, is, however, very iharked, and appears to indicatesomething more than defects of observation, probably a veritablechange in the secular variation. In Ohio, Indiana, and Illinois is seenthe change in curvature due to the approach of the zero point of thesecular variation. This occurs in Ohio about 1810, in Indiana in 1820,and in Illinois about the same year, or perhaps 1830. In Michigan, onthe other hand, which should show a depression in the early part of thecentury synchronous with that in India

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Author Geological Survey (U.S.)
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Volume
InfoField
1895
Flickr tags
InfoField
  • bookid:annualreportofun1711geol
  • bookyear:1880
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Geological_Survey__U_S__
  • booksubject:Geological_Survey__U_S__
  • booksubject:Geology
  • booksubject:Water_supply
  • booksubject:Forest_reserves
  • booksubject:Mines_and_mineral_resources
  • bookpublisher:Washington___G_P_O_
  • bookcontributor:University_of_Illinois_Urbana_Champaign
  • booksponsor:University_of_Illinois_Urbana_Champaign
  • bookleafnumber:334
  • bookcollection:university_of_illinois_urbana-champaign
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
30 July 2014



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