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Show f 32 days only very few observations for latitude were taken, after he had waited until late at night expecting to get the use of the wires for longitude- work. Description of observatory and instruments used.- The construction of the observatory was the same as at Carl in, aud a description of it will be found in the report for that station. The same instruments for time- determination aiul exchange of signals were also used. For the latter purpose the wires of the Western Union Telegraph Company were employed. The observer, E. P. Austin, was assisted at this point by two enlisted men. Points with which connections were made.- It was intended to connect Battle Mountain with Washington and Detroit, but it was impracticable to connect with Washington, and the exchange of signals was made with Detroit only, wheie Mr. O. B. Wheeler, assistant United States lake- survey, conducted both observations and computations. An explanation of the signs and symbols used in the determination of time at Detroit will be found in the report for Carlin station. The observations made at Battle Mountain were reduced in 1873 by Dr. F. Kampf, and revised in 1S74. The arrangement of the report was also made by him. Instrumental values, cCr.- The instrumental values are given in the report for Carlin station. The signals were sent by sound from Battle Mountain, and recorded by eye and ear. At Detroit they were sent by sound also, but recorded on a chronograph. By means of automatic repeaters at Corinne, Cheyenne, Omaha, and Chicago, the signals were transmitted direct to the connected stations. It has been found impossible to get a better result for longitude. The observer used for temporary monuments pieces of wood buried in the ground, which proved too unsteady to give the most accurate results. These temporary monuments were replaced later by a sandstone pier. Computation of clocJc- correction for Detroit, June 1, 1871. DL W. W. Star. Serpentis Serpontis Urwe Minoris . .. Corona) Boroalis Scorpii Ophiuchi Uorcnlia Ophiuchi < J frsse Minorie 1 Aqnilse i 2 A qui ho 1 to Aqnilm ! 6 Aqnilffi i y Aquila) ' u AqniUe & Aquibo Bb 1 & + .23 + .20 + .94 f .24 + .10 Ce .. 1 + .11 I- . 10 + . » 1 + .12 f- . 1 1 1 h. m. 8. h. m. 15 39 04. 91 15 37 45 33. 21 | 44 49 56. 06 I 48 53 24.93 i 52 59 06. 39 57 16 OH 43. 31 16 07 17 00. 15 , 15 52 44.06 51 & 56.36 24.71 49.16 16.53 57.91 36.71 53.74 35.27 18 15 23. 94 18 14 17. 23 29 21. 54 2d 12. 61 19 00 39.26 J 59 30.13 12 56.11 19 11 46.93 20 10. 03 | 19 00 85 41 17. 97 40 OS. 78 45 39. 61 i 44 : w. 50 50 08.92 i 44 59.71 ( a - * ) m. 9. I - 1 08.91 08. fc2 , OP. 44 ' 08.77 08.70 0?. 84 0* 85 09.13 06.89 I 08.90 09.17 09.20 09.20 09.23 09. 15 09* 25 0. - f. 08 - 02 -.* 03 -. 22 - . ' 06 - r- OS + . 20 - . 2 3 - r. 05 - . 0 6 - r. 03 - 1- 04 - . 0 5 - r. 04 Normal equations. + 151.98a + 0.96p - 6. 88 69 + 19.62 = 0 r 0. 96 a + 4 * 91 p - 3. 57 = 0 - 6.88 a + 16.00 i 0 + 13. 45 = 0 a = » - 0*. 17 c = - 0 « . 10, lamp ea* t. p = . j. 0". 087, per hoar. A t = - 1- 08 » . 91 ± 0 « . 021, at 17* &•-. |