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27, 28

Mr. Pond's Catalogue of Eighty-four

B Cephei. 1812, Oct. 22, 24, 26, 29, 31,1}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,

330,985 Mean of 30 30,634 20, 22, 23 Aug. 24, 25, 26, 30, 31, Sept. 2

|}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; }31,500 Mean of 1031,500

15, 20, Aug. 14, Oct. 1, 2, 3 Oct. 4, 6, 14, 15, 18, 19, 20, 23.1}31,596 Mean of 20 31,548 Oct. 30, Nov. 4, 5,

Nov. 4, 5, 9. 1813, Mar. 23, 26, 29, 31, Apr. 2, 3

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

1}31,731 Mean of 40 31,588 May 24, 26, 31, June 1, 7, 8,

}31,124 Mean of 50 (31,495 9, 11, 16, 25 June 26, 27, July 6, 10, 18, 20, }81,279 Mean of 6o|31,459

, , , 6

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

Cephei. 1812, Oct. 28, 29, 31, Nov. 3.)}12,484 Mean of 1012,484

21, 22, Dec. 5, 8, 9, 13 1813, Mar. 20, Apr: 1, 3, 8, 12, 19,735 Mean of 20 12,610

Aug. 11, 12, 13, 15, 16 Aug. 17, 19, 20, 21, 22, 23, 24,1} 12,435 Mean of 30 12,551

25, 30, 31 Sept. 2, 3, 4, 5, 6, 7, 8, 9, 10,

1} 12,228 Mean of 40 12,470 Exact to a quarter of a second.

20, 26

a

14

a Cassiop.

29, Dec. 6

1812, June 17, 22, 28, July 6,3

7, Oct. 26, 28, 29, 31, Nov.%}}22,889 Mean of 1022,839 Nov. 4, 5, 6, 7, 19, 20, 22, 28,

}22,456 Mean of 20 22,647 Dec. 7, 8, 9, 10, 1819, Jan. 9. } 522,59 Mean of 30 22,630

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

1}33,041 Mean of 40 32,726

This result may, I think, be relied on, to a quarter of a second.

7

Ursa Major.

[ocr errors]

10, 11, 12

1812, June 22, Oct. 27, 28,

Nov. 8, 5, 6, 21, 24, Dec. 6. 440 Mean of 10 (55,440 1819, Mar. 17

Prior Mar. 21, Apr. 1, 3, 4, 7, 8, 95} 54-975 Mean of 20 55,207 Apr. 13, 14, 16, 17, 20, 36,

}55,489 Mean of 30 55,301 May 29, 26, 28, 99 May 31, June 1, 7, 8, 12, 23, 25, 27, July 5, 6

***]}55,457 Mean of 40 55,340 July 16, 20, 30, Aug. 7, 20, 31,1}54,952 Mean of 48 55,275 Sept. 12, 14

||

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

7

Draconis.

3,602

1812, June 15, 16, 21, 23, 28,

} 3,845 Mean of 10 3,845 29, July 6, 7, 8, 9 July 10, 11, 14, 17, 19, 20, 21,

} 3.779 Mean of 20 3,819 22, 28, 29 aly 30, 31, Aug. 1, 3, 12, 13} 3,182 Mean of 30

15, 17, 20, 21 Sept. 15, 16, 18, 19, 20, 21 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, Dec. 5, 6, 8

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

} 3,472 Mean of 70

3,635 22, 24, 25, 26, 27, 28 July 5, 6, 9, 10, 11, 12, 13, 16,

} 3,980 Mean of So 3,674

17, 18

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

} 3,477 Mean of 90 3,652 27, 28, 29

This determination of , Draconis is extremely exact. Its zenith distance has also been determined, with equal accuracy, by 120 observations made with the zenith sector during the years 1811 and 1818: the mean of above 60 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 1819 Mean zen. distance by zenith sector

9 17.85 N.P.D. by mural circle

38 29 3.65 Sum or Co. latitude

38 31 21.5

% 17.9

22, 23, 25

, Ursa Major. 1812, June 11, 12, 13, 14, 15,357,671 Mean of 1057,671

17, 20, 20, 22, 23, 24June 28, July 6, 7, 8, 9, 11, 15, 18, 20, 28 20,78

}58,069 Mean of 20 57,870 Aug. 7, 15, 19, 20, 22, Sept. 16,

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

8, 24, 28, 30, Nov./}58,000 Mean of 40 57.969 5, 6, 7, 14 Q. Loe Nov. 18, 21, 23, Dec. 5, 8, 29.

1818, May 26, 28, 31, June 1]} 57.848 Mean of 50 57,845 June 4, 7, 10, 11, 12, 16, 21, 358,123 Mean of 60 57,891 June 26, 27, July 5, 6, 9, 16,

1}58,057 Mean of 70 57.915 18, 19, 20, 29 July 24, 27, 28, 29, 30, Aug.

3, 12, 13, 16, 19 | 57,641 80

This result is probably not inferior in precision to the last. and $ 55 ETT OP PIP i bra Persei. 1812, July 7, 9, 17, 20, 21, 28,352,970 Mean of 10 59,970 Aug. 16, 17, Dec. 8, 12

bun lo

1813, Jan. 2 10,11, 22, 24, 28, Feb. 3 $ f}52,417 Mean of 30 59,693 Feb. 23, March 1, 4, 6, 7, 17}52,468 Mean of 30 52,618

19, Apr. 11, 12, 13 Apr. 14, 18, May 87, 28, June | } 52,824 Mean of 40|52,670

6, 15,
Exact to a quarter of a second.

Capella.

31, Feb. 93,

Mar. 1

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

8, 9, 10, 14, 20, 23 July 28, 30, Aug, 13, 16, 17}21,009 Mean of 20 20,998

, Jan. 2,%, Jan. 10, 11, 16, 22, 24, 27, 28,

}20,719 Mean of 30 20,905 Mar. 2, 3, 5, 6, 7, 19, 17, 18,}19,952 Mean of

19,951 40 20,667 22, Apr. 8 Apr. 9, 10, 11, 12, 13, 14, 15,

}21,134 Mean of 50 20,758 17, 18, 20 Apr. 21, May 28, 29, June 1, 2, 20, July 4, 5, 6, 18

}19,537 Mean of 60 20,555 July 15, 16, 17, 22, 23, 25, 28, 320,258 Mean of 7020,519 Aug. 3, 5, 6, 8, 9, 10, 11, 13,320,061 Mean of 80 20,468

29, 30, 31

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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