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286 Mr. Pond's Catalogue of Eighty-four

B Cephei. 1812, Oct. 22, 24, 26, 29, 31, 30,574 Mean of 10 30,574

Nov. 3, 4, 21, 22, Dec. 5 Dec. 8, 9, 13. 1813, Mar. 16,

}30,343 Mean of 20 30,458 20, Apr. 1, 2, 3, 8, 14 Aug. 11, 12, 13, 15, 16 17. 19}30,985 Mean of 30 30,634

20, 22, 23 Aug. 24, 25, 26, 30, 31, Sept. 2

1

}30,894 Mean of 40 30,699 3, 4, 5, 6 This result is probably exact to a quarter of a second.

« Ursa Major. 1812, June 13, 29, July 9, 10:13

}31,500 Mean of 10 31,500 15, 20, Aug. 14, Oct. 1, 2,8 Oct. 4, 6, 14, 15, 18, 19, 20, 23, 31,596 Mean of 20 31,548 Oct. 30, Nov. 4, 5, 9. 1819. Mar. 23, 26, 29, 31, Apr. 2,3

}91,595 Mean of 30 31,540 Apr. 4, 7, 8, 9, 10, 12, 13, 14,

}
31,731 Mean of

Mean of 40 31,588

27, 28

20, 26

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May 24, 26, 31, June 1, 7, 8, 9, 11, 16, 25

|}31,124 Mean of 50 31,495 June 26, 27, July 6, 10, 18, 20,

}31,279 Mean of 60 31,459 85, 30, Aug. 5,

6 This result seems to be extremely exact, and probably does not differ more than one-tenth of a second from the truth.

a Cephei. 1812, Oct. 28, 29, 31, Nov. 3. } 12,484 Mean of 10 12,484

3, 21, 22, Dec. 5, 8, 9, 13 1813, Mar. 20, Apr. 1, 3, 8, 12,

} 12,735 Mean of 20 12,610 Aug. 11, 12, 13, 15, 16 Aug. 17, 19, 20, 21, 22, 23, 24,

} 12,435 Mean of 30 12,551 25, 30, 31 Sept. 2, 3, 4, 5, 6, 7, 8, 9, 10,

}12,228 Mean of 40 12,470 14

Exact to a quarter of a second.

a Cassiop.

29, Dec. 6

1812, June 17, 22, 28, July 6,3 22,889 Mean of 1093,839

; } 7, Oct, 26, 28,

, 29, 31,

Nov. Nov. 4, 5, 6, 7, 19, 20, 22, 28,

}22,456 Mean of 20 22,647 Dec. 7, 8, 9, 10, 1819, Jan. 9.} 529,59 Mean of 30 22,630

,

1 10, 16, 22, 24, Apr. 8 Apr. 9, 11, 17, May 26, 27, 28, 31, June 7, 10, 12

23,041 Mean of 4029,726 This result may, I think, be relied on, to a quarter of a

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second.

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g Ursa Major.

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10, 11, 12

1812, June 12, Oct. 27, 28,

Nov. 8, 5,6, 21, 24, Dec. 6. }55,440 Mean of 10 55,440 1813, Mar. 17

ole Mar. 21, Apr. 1, 3, 4, 7, 8, 9; } 54975 Mean of 20 55,207

Se Apr. 13, 14, 16, 17, 20, 36, }55,489 Mean of 30 55,301

May 29, 26, 28, 29 May 31, June 1, 7, 8, 12, 23355,457 Mean of 40 55,840

25, 27, July 5, 6 July 16, 20, 30, Aug. 7, 20,81,}54-952 Mean of 48|55,275

14

از ارزی

This result, like the last, is probably exact to a quarter of a second.

Vititi. Po

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Draconis.

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1812, June 15, 16, 21, 23, 28,|} 5,845 Mean of 10 3,845

, , , 29, July 6, 7, 8, 9 July 10, 11, 14, 17, 19, 20, 21,

} 8,779 Mean of 20 3819 22, 28, 29 July 30, 31, Aug. 1, 3, 12, 13}

3,182 Mean of 30 3,602 15, 17, 20, 21 Sept. 15, 16, 18, 19, 20, 21,17 Oct. 1, 3, 5,8

} 3,604 Mean of 40 3,603 Oct. 9, 15, 21, 24, 26, 28, 29, 3,651 Mean of 50 3,612

, 31, Nov. 3,6 Nov. 8, 15, 19, 20, 21, 22, 23,

} 3,877 Mean of 60 3,656 Dec. 5, 6,8 Dec. 9, 10, 13, 15. 1818, June

} 3,471 Mean of 70 3,685 22, 24, 25, 26, 27, 28 July 5, 6, 9, 10, 11, 12, 13, 16,

} 3,980 Mean of So 3,674

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17, 18

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July 19, 20, 22, 23, 24, 25, 26,

} 3,477 Mean of 90 3,652 27, 28, 29 This determination of y Draconis is extremely exact. Its

g zenith distance has also been determined, with equal accuracy, by 190 observations made with the zenith sector during the years 1811 and 1812: the mean of above 6o observations of 1811 do not differ more than one-tenth of a second from the mean of an equal number in 1812. Mean zenith distance beginning of 1813 by observations of 1811

2 17.8 By observations in 1818

% 17.9 Mean zen. distance by zenith sector

% 17.85 N. P.D. by mural circle

38 29 3.65 Sum or Co, latitude

38 31 21.5

, 29

8,

1

Ursa Major. 1812, June 11, 12, 13, 14, 15} 57,672 Mean of 10 57,671

| 17, 20, 20, 22, 23, 24 : June 28, July 6, 7, 8, 9, 11, 1511} 58,069 Mean of 2057,870 18, 20, 28

038 Aug: 7, 15, 19, 20, 22, Sept. 16,

|}58,138 Mean of 30 57,966 18, 20, 21, Oct. 4 Oct. 5, 7, 8, 24, 28, 30, Nov.

|} 58,000 Mean of 40(57,969 5, 6, 7, 14 mm 120

33.33 Nov. 18, 21, 23,

Dec. 1818, May 26, 28, 31, June" i|} 57,348 Mean of 50 (57,845 June 4, 7, 10, 11, 12, 16, 21,}58,123 Mean of 60 57,891

22, 23, 25 June 26, 27, July 5, 6, 9, 16, 358,057 Mean of 70 57.915

, 6 18, 19, 20, 29

, , , , 121316, 19 This result is probably not inferior in precision to the last.

a Persei. 1812, July 7, 9, 17, 20, 21, 28, } 52,970 Mean of 10 32,970

Aug. 16, 17, Dec. 8, 12 Dec. 13, 14, 28. 1813, Jan. 8,

}52,417 Mean of 20 52,693 10, 11, 22, 24, 28, Feb. 5 Feb. 23, March 1, 4, 6, 7, 17 }52,468 Mean of 30|52,618

, Apr. 14, 18, May 7, 28, June|}52,824 Mean of 40|52,670 1, 196, 15, 17

Exact to a quarter of a second.

July 24

, 27, 28, 29, 30, Aug. 57.641 Mean of 80 157,881

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Capella.

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1812, June 15, 26, 28, July 7,1}20,987 Mean of 10 26,987

8, 9, 10, 14, 20, 23 July 28, 30, Aug. 13, 16, 1721,009 Mean of 20 20,998

19, 21. 1813, Jan. 2, 7, Jan, 10, 11, 16, 22, 24, 27, 28,

320,719 Mean of 30 20,905

} 31, Feb. 89, Mar. 1

93 Mar. 2, 3, 5, 6, 7, 12, 17, 18,

}19,951 Mean of 40 20,667 22, Apr. 8 Apr. 9, 10, 11, 12, 13, 14, 15, 21,184 Mean of 50 20,758

,

} 17, 18, 20 Apr. 21, May 28, 29, June 1, }19,537 Mean of 60 20,555

2, 20, July 4, 5, 6, 19 July 15, 16, 17, 22, 23, 25, 28,

}

20,258 Mean of 70 20,512 29, 30, 31

Aug: 3, 5, 6, 8, 9, 10, 11, 13,)}20,061 Mean of 80 20,468

15, 17

One of the above series differs a second from the mean of the whole, a circumstance very unusual, but quite unconnected with error of division, I attribute it to want of sufficient care in reading off the microscopes. The mean result may, nevertheless, be depended upon to a quarter of a second.

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