Result adopted-Chronometer No. 2557, fast of sidereal time for this station (at 15h. 37m.) By comparison-Chronometer No. 141, was slow of mean solar time for this station (at 10h. 48m. mean time) 23d. 1859, June 6th. At the same Station. 4 44.22 Result adopted-Chronometer No. 2557, fast of sidereal time for this station (at 15h. 11m.) By comparison-Chronometer No. 141, was slow of mean solar time for this station (at 10h. 11m. mean time) 24th. 1859, June 10th. Sidereal chronometer No. 2557, fast: At the same Station. 4 44.80 Resuit adopted-Chronometer No. 2557, fast of sidereal time for this station (at 15h. 53m.) By comparison-Chronometer No. 141, was slow of mean solar time for this station (at 10h. 37m. mean time) 25th. 1859, June 22d. At the same Station. Sidereal chronometer No. 2557, fast: By 10 observations on ♪ Leonis, west (at 15h. 16m.) 4 46.59 1st Set. 1 40 48.05 Result adopted-Chronometer No. 2557, fast of sidereal time for this station (at 16h. 04m.) VOL. VII.-F +1 40 48.00 By comparison-Chronometer No. 141, was slow of mean solar time for this station (at 10h. 02m. mean time) 26th. 1859, June 24th. At the same Station. Sidereal chronometer No. 2557, fast: Result adopted-Chronometer No. 2557, fast of sidereal time for this station (at 16h. 14m.) By comparison-Chronometer No. 141, was slow of mean solar time for this station (at 10h. 03m. mean time) 27th. (Omitted in the proper order of dates.) 1858, March 22d. At Chicago Observing Station, No. 1, in lat. 41° 53′ 50′′.3 N.: long. 5h. 50m. 30.99s. west of the meridian of Greenwich. See page 351 of Vol. VI. of the Society's Proceedings. Mean solar chronometer No. 141, slow of mean time, at apparent noon: By 5 pairs of equal altitudes of the sun's upper and lower limbs By comparison.-Sidereal chronometer No. 2557, fast of sidereal time for this station, at apparent noon, (say at Oh. 06m. 44s. sidereal time) I desired to get observations on East and West Stars for the time on the night of March 22d; but the sky was entirely clouded, which prevented it. On the next morning (March 23) I started with both chronometers, the sextant and artificial horizon, on a journey to Fulton and Albany, Illinois. I also visited Lyons, in lowa. Having observed for the latitude and longitude of these places-depending for the longitude on the run of the two chronometers—I returned to Chicago on the evening of March 29th, 1858, and made the following observations for the time, viz: 28th. 1858, March 29th. At Chicago Observing Station No. 1. Sidereal chronometer No. 2557, fast: By 7 observations on a Tauri, west (at 8h. 48m.) By 11 observations on ẞ Tauri, also west (at 9h. 21m.) m. S. 50 26.94 50 27.14 50 27.06 Result-Chronometer No. 2557, fast of sidereal time for this station (at 9h. 44m.) sidereal time |