. Reports upon the survey of the boundary between the territory of the United States and the possessions of Great Britain from the Lake of the woods to the summit of the Rocky mountains . minaliout), 4,° CO t = = = = 1872, UNITED STATES NOETHERN 12. Station, Camp No. 1, xeak Pembina, Dak. Observations to determine the value of one turn of tlic micrometer of Zenith TelescopeWUrdemann Xo. 7, by the eastern elongation of Folaris, Chronometer Xef/iis 1514, sidereal. [, W. J. Tn-iuing, Captaiu Uniteil States Engiiieurs.] log cot S =
. Reports upon the survey of the boundary between the territory of the United States and the possessions of Great Britain from the Lake of the woods to the summit of the Rocky mountains . minaliout), 4,° CO t = = = = 1872, UNITED STATES NOETHERN 12. Station, Camp No. 1, xeak Pembina, Dak. Observations to determine the value of one turn of tlic micrometer of Zenith TelescopeWUrdemann Xo. 7, by the eastern elongation of Folaris, Chronometer Xef/iis 1514, sidereal. [, W. J. Tn-iuing, Captaiu Uniteil States Engiiieurs.] log cot S = (ie log tang 2j fa in time = 5 53 40>.8 Cliio. A. E. = 1 IS 37>.5 Cliro. time of clong. = 19 18° A. E. of Polaris, 1 IS of Polaris, 88<= .17 Assumed ij, 48° 59 siu (z — :^) — cos 5 sin (T — T„) log coscc i = 0-0001248log sin ij = CCS z„ = 9 877,S!18:! Za = 40° 58 ?^^yHi~,T,^^ notation and method adopted in this computation are derived from the .article on the Zenith Telescope paeo 300Vol. II, Chauvenets Spherical .and Practical Astronomy. f ,i b .. 170 STATES NORTHERN BOUNDARY. September 21. Station, Camp No. 1, neab Pembina, Dak. Obnervations to determine the value of one division of the level of Zenith Telescope Wilrdc-mann No. 7, in terms of the micrometer. Marie, crosshairs of Zenith Telescope No. 11. [Observer, W. J. Twining, Captain TJuited States Engineers.] No. a a;= o |-| a ^ 7i Means. a o IS it j5« Meaua. Level, firstposition. Level, secondposition. O p o a-§i - 3 ?32 V V V N. S. N. S. 1 23. .0375 . 003306 3 2-1. v:> 24. 24. 580 .0158 .000350 a .587 24. 578 24. .987 (1. .00
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