Directions for Magnetic Measurements

Cover Directions for Magnetic Measurements
Directions for Magnetic Measurements
U.S. Coast And Geodetic Survey
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7 Circle west, needle face east.
Circle east, needle face west.
D.
R.
R.
D.
S. N.
S. N.
S. N.
S.
N.
210 30 30 38 28 40 273 10 15 93 29 30 329 02 149 10 03 10 265 24 85 36 27 32 02. 5 10.
25. 5 34.
29. 39.
12. 5 29. 5 30 53. 8 125 24. 0 62 42. 7 = 62 19. 8 94 30. 2 63 36. 4 31 48. 2 30 34. 62 47. 31 23. 5 u = 31 35. 9 93 123 61 21. 0 55. 0 57. 5 Chron. Time. Temp.
h. M. Beginning 10 05 21. 0 Ending 10 20 20. 8 Computation of F and 77.
log cos 7' 9. 95336 ! " cscw 0. 28427 " cscu' 0. 00015 9. 953
...07 0. 28070 0. 00014 Mean Corr'n on L. M. T.
L. M. T.
10 12 20. 9 +23 10 35 Sum 0. 23778 Half sum 0. 11889 log C 9. 62333 0. 23391 0. 11696 9. 62497 " F 9. 74222 !
9. 74193 7 from deflections 62 21. 7 from regular dipJNo. 1 62 22. 3 needles (No. 2 62 26. 7 Mean 9. 74208 F= . 55218 log cos 7 9. 66574 " 77 9. 40782 77=. 25575 * If the vertical circle is graduated in quadrants, note whether the upper (south) end of the suspended needle is north or south of the vertical.
DIRECTIONS FOR OBSERVATIONS AT SEA.


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