Beginning of the Eclipse 8^h 49′ 55″ } Apparent
End of the same 11 41 15 } time.
N.B. The clock stopped once during the Observation, owing, it was
supposed, to the cold weather; but was oiled a little, and set a going
again by a stop-watch that beats seconds, and which was set with the
clock at the beginning of the eclipse: so that she lost no time. She was
examined at noon, and found as above by the meridian mark. But this mark
itself, having been lately shaken with the stormy weather, is to be
re-examined, and also equal altitudes taken the following days.
The annexed micrometer measures were taken for determining the quantity
of the eclipse, chiefly by Mr. Rittenhouse. More would have been taken,
but the Sun was hid under clouds for about an hour after the middle of
the eclipse, and broke out again a little before the end.
_Micrometer Measures._
h ′ ″ inches. tenths. 500ths.
9 15 0 2 2 6 } distances of the cusps.
31 0 3 1 ½ }
10 17 5 1 1 14 } enlightened parts remaining.
22 0 1 1 23 }
11 37 0 1 7 6 }
38 46 1 5 21 } distances of the cusps.
42 26 1 2 18 }
_Continuation of the Observations for adjusting the Clock._
Jan. 11th. ☉’s W. limb on Merid. } [A48]
E. limb on do. }
—————
Centre on do.
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Footnote A48:
The calculations are here wanting, in Dr. Smith’s MSS.
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Whence clock faster than mean time 0 1′ 46″ per merid. mark.
Equal Altitudes.
h ′ ″
20th. 9 37 20 59 49 }
39 1 58 6 } Mean noon per clock 12 18 34
40 41 2 56 26 }
21st. W. limb on Merid. 12 20 3
E. limb on do. 22 22
——————