Geodesy : the eastern oblique arc of the United States and osculating spheroid / by ChasASchott . Dauphin Island East Base Dauphin Island West Base Meters. Feet. 120 393 95 3l 81 265 86 284 83 274 73 240 64 210 46 152 40 132 8 27 I 3 I 3 composing the figure equa ?^?^V^ I T the The country being well timbered and cutting im-practicable, it was necessary to elevate the theodolite onscaffolds ranging from i24 to 465 in height, withseveral 37 high. All observing was done at night onsignal lights. The mean closing error derived from 28 triangles 28 mean error of an angle is ±o6S, and the probable
Geodesy : the eastern oblique arc of the United States and osculating spheroid / by ChasASchott . Dauphin Island East Base Dauphin Island West Base Meters. Feet. 120 393 95 3l 81 265 86 284 83 274 73 240 64 210 46 152 40 132 8 27 I 3 I 3 composing the figure equa ?^?^V^ I T the The country being well timbered and cutting im-practicable, it was necessary to elevate the theodolite onscaffolds ranging from i24 to 465 in height, withseveral 37 high. All observing was done at night onsignal lights. The mean closing error derived from 28 triangles 28 mean error of an angle is ±o6S, and the probable Ilyerror of a direction, o674—7= = d=o 34. V 6 For the several sections these last values are verynearly equal notwithstanding the number of observers,of instruments, and methods, and other circumstances,such as elevation of instruments, day or night observa-tions, etc. The values of the probable error of adirection for the second, third, fourth, and fifth sec-tions average dro34, which indicates that the tri-angulation of Alabama is of a high degree of — No. 7—02 14. ColdCreeU St. Elmo. DcLuphinIs IcLixd. BcLS e FortMorgan Kilometers o 10 20 Statxite Miles 30 10 2IO THE EASTERN OBLIQUE ARC. Abstracts of horizontal directions at stations composing the fift/i and last section of the triangulation west of the Atlanta base net. /Sgj-/SgS. Creagh, Clarke County, Alabama. Augvist 9 to September 10, 1S95. 30™ direction theodolite G. A. Fairfield, observer. Circle used in XVI positions. Telescope I2™4 above the ground. Number ofdirections. Objects observed. Results from adjust- Corrections of Finalnient of fourth section, fifth section. seconds WhitePollardRed Hill o 00 00 00270 04 54 -92320 37 14 96 -o 16 -0-31 00 \(y 15 27 /()//<7;-(/, Monroe County, Alabama. August 29 to vSeptember 13, 1S95. 30-repeating theodolite F. W. Perkins, observer. Telescope 465 above the ground. I Red Hill 2 White Creagh 0 00 00 00 —0 -40 55 52 09 -60 +0-17 93 0
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