. Carnegie Institution of Washington publication. Dip-Needle Errors 363 fall near normal at this point could as well be drawn for one condition as for the other. In this case the result is controlled by needles No. 1 and No. 5, which are chosen on the evidence of adjacent stations. The complete analysis to determine the corrections starting from observed needle-differences is given in Table 45. The second example, shown by Figure 5, illustrates a similar case from a region of southerly or negative inclination. This short expedition comprises 21 stations in South Australia, at which the observa
. Carnegie Institution of Washington publication. Dip-Needle Errors 363 fall near normal at this point could as well be drawn for one condition as for the other. In this case the result is controlled by needles No. 1 and No. 5, which are chosen on the evidence of adjacent stations. The complete analysis to determine the corrections starting from observed needle-differences is given in Table 45. The second example, shown by Figure 5, illustrates a similar case from a region of southerly or negative inclination. This short expedition comprises 21 stations in South Australia, at which the observations were made by Observer A. L. Kennedy in 1914 using circle No. 41 with needles Nos. 1 and 2 of No. 178 and Nos. 5 and 6 of No. 41. Of these needles the correction for No. 5 only had been determined by comparison, and that at some time previous in a region of different inclination. Assuming the correction thus determined to have remained constant, the corrections for the other 3 were worked out by the foregoing method. The amplitude of the variation of needle No. 6 is greater and takes place within a range of inclination less than has been found in other -Correction-Curves for Needles used with Circle No. 41 during 1914. grouped as indicated by plots for each needle.) (The 21 stations are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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