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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)

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23d. 1859, June 6th. At the same Station.

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4 44.22

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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:

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At the same Station.

4 44.80

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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)

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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.

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1 40 48.05

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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)

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26th. 1859, June 24th. At the same Station.

Sidereal chronometer No. 2557, fast:

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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)

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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)

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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.)

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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

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