| OCR Text |
Show 42 The wires of the Western Union Telegraph Company were used for exchange of signals. For time and latitude observations the same instruments were used as at Carlin and Battle Mountain, a description of which is given in the proper place in the report on Carlin. Connection was made with Washington and Detroit; Washington could be reached only once. The result derived from the exchanges between Austin, and Detroit and Washington for the longitude of Detroit is again larger than that given in the Report of the Chief of Engineers for 1871. This discrepancy of the results, being all independent of each other, will be investigated at another time. The observations for time were taken on the 16th, 26th, and 29th of June; those for latitude on June 15,17, 21, and 23. The corresponding determinations for time at Detroit were taken by Mr. O. B. Wheeler, assistaut United States lake- survey, and at Washington by Prof. John R. Eastman, United States Naval Observatory. The reductions of the observations, made at the connected places, were made in the respective offices; those for Austin station by Dr. F. Kampf, who also prepared the report. The explanation of signs in the report for the Detroit observations will be found in the report for Carlin; the same report contains the observations and computations for time relating to Washington. For the reductions of observations made at Austin, the same instrumental values as given in the report on Carlin station were used. The signals were sent through by means of automatic repeaters; the number of them and also the places where they are situated are given in the Carliu report. Computation of dock- correctionfor Detroit, June 16,1871. ill. W. W. E. E. W. W. Star. 0 Bootis 48 Ophei, L. C 0 LibriB a Coronae Borealis a Serpentis * Serpentis £ Urate Afinoris ... t Coronas Borealis i Ophiuchi £ Ophiuchi » Herculis K Opbinchi « TTrsae Minoria ... aK1 AHqeuriclfulBli s y Aqnilie a Aquilte 0 Aquilse A Ure » Minprifl . A Urate Minorifl . a* Capricorui c Delphini C A* - r .04 4- .03 4- .03 + .03 4- .03 + .16 + .03 4- .03 - .03 - .04 - .03 - .03 - .03 - .03 - .03 - .03 4- .03 + .03 Aberr. - .02 + .06 - .01 - .03 - .01 - .01 - .07 - .03 - .01 - .01 - .08 - .01 - .10 - .03 - .01 - .01 - .01 - .01 - .74 4- - 74 - .01 - .01 $. 4- .29 - .47 4- .14 4- 23 4- .19 4- .19 4- .97 4- .38 4- .18 4- .12 4- .24 4- - 17 4- 1.16 4- .18 4- 06 4- .08 4- .08 4- .07 + 3.88 4- 3.88 4- .06 + .09 Ce 4- .08 - .29 + .07 4- .07 4- .07 4- .06 4- .31 4- .07 4- .06 - .07 - .08 - .07 - .47 - .07 - .07 - .07 - .07 - .07 - 3.39 u .07 4- 07 h. m. 9. 14 58 32.36 15 05 25.13 11 30.94 30 40.68 39 22.07 45 50. 31 50 13.81 53 43.05 16 09 02. 44 31 30.68 39 56.30 53 01.20 17 00 50.24 10 13.51 19 31 24. 57 41 35. 08 45 56.92 50 26.10 19 55 44. 83 29.67 20 12 21.07 28 30.22 h. m. s. 14 57 06.78 3 03 5a 79 15 10 05. 49 29 15.14 37 56.38 44 24.75 48 48.52 53 16.54 16 07 36.79 30 05.11 38 30.35 51 35.39 59 25. 52 17 08 47.64 19 29 5a 69 40 09.12 44 30.85 49 00.06 54 13.55 20 10 55.20 27 04.33 ( a - 0 m. « . - 1 25.97 25.63 25.68 25.85 25.97 25.83 25.66 25.87 25.91 2F. 58 26 05 2?. 87 2f. 31 25.93 25.93 25.93 26.04 26.00 31.03 26.03 26.07 8. 4-. 16 .15 .01 .12 .03 .16 .01 .03 .32 .14 .05 .00 - .01 - .05 4- .07 4- .03 .08 .06 Normal equations. 4- 49.63 a 4- 9.61 p 4- 1.74 8 0 4- 3.60 = 0 4- 1480.91 a' 4- 90.89 p - 34.62 i 9 - 238.03 = 0 4- 9.61 a 4- 90.89 a' 4- 77.44 p - 16.81 = 0 4- 1.74 a - 34.62 a' 4- 21.00 < J 0 4- 23.13 = 0 a = - 0 » . 01 a' - + 0*. 14 c = - 0*. 06 lamp east, p = 4- 0'. 051, per hoar. At = - 1- 25\ 93 ± 0\ 019 at l? h 19- |
