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Show 23 The following table contains the corrections of the chronometer aud its rate, to obtain the correction for the time of exchange: Mavl9,1871 May S3, 1J< 71 May 24, 1 « 71 Date. { Local Bide-l real time. 1 h. 12.65? 17 000 1 14.508 Corrections of chronometer. m. s. + 4 43.445 + 4 40.060 + 4 40.246 Hourly rate. 9. - 0.034 + 0.009 - r 0.009 For exchange, mean- solar- time chronometer Hutton No. 288 was always used. May 19,1 find in the proper place only one comparison of Negus 1344 with Hutton 288: K. m. 8. h. m. « . Negn8..- 1344 13 30 20 0 13 33 27.0 Hutton.. 288 9 21 20.0 9 24 26.5 Hutton 288, at 9* 22m 538.25, is slow of local sidereal time 4U 13m 43 » . 666. In another place I find oue comparison made May 19, in the morning, and one at nearly the same time May 20: May 19. May 20. ft. m. 8. Negus... 0 32 12.0 Hutton.. 20 25 21.50 Therefore, I find the rate of Hutton 288 from the morning to the evening of May 19, + 99.9785, aud from the evening to the next morning, + 9a. 9641, both for one hour of Hutton 2S8. To reduce Hutton for the time of exchange, the mean + 98.9713 is used. For May 23 and May 24, one comparison was made before and after exchange. May 23. A. m. 8. 1 41 31.0 21 30 29.5 h. m. 1 44 21 33 8. 34.0 32.0 Negns... l344 Hutton.. 288 Negus.. Hutton. Negns.. Hutton. Negus.. Hutton. h. 13 9 77t. 8. h. m. 27 18.0 13 30 2 24.5 9 5 And after exchange .1314 . " 2< S .1344 . 2 « 0 .1344 . 288 h. m. 8. 16 12 10.0 11 46 49.5 May 24. h. TO. « . 13 34 32.0 9 5 37.5 After exchange: A. m. 8. 15' 30. 19.0 11 1 5.5 8. 25.0 31.0 h. 16 11 h. 13 9 h. 15 11 m. 15 49 m. 37 8 TO. 33 4 h. m. 13 33 9 8 8. 15.0 54.0 8, & 5.0 40.0 8. 20.0 6.0 8. 34.0 39.5 From these comparisons and the rate given for Negus 1344, the following table for Hutton 288 is derived: Bate. Mayl9,1S71 May 23, 1871 May 24,1871 Hours on the face of Hutton'* chronometer. I Hutton 288 behind local sidereal time. A. TO. 9. h. TO. 9. 9 22 53.25 | 4 13 43.666 10 26 56.72 , 4 29 47.454 10 4 52.25 4 33 44.496 Losing per hour on face I T . „ n . u i ,* ofHutton'a ^ Karithm. chronometer.; 9. 9.9713 9. t* 478 9.8832 0.9987518 0. 9933402 0.9946986 The logarithm is used to convert the chronometer- time of the means of the signals into sidereal time. |