330 



Results of Makerstoun Observations, 1844. 



TABLE I. — Mean Westerly Declination for each Civil Week-Day, Week, and Month, in 1844. 



Civil 

 Day. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 





25°. 

 / 



25°. 

 / 



25°. 

 f 



25°. 

 / 



25°. 



25°. 

 / 



25°. 



25°. 

 I 



25°. 

 I 



25°. 



25°. 

 / 



25°. 

 / 



1 



19-78 



20-31 



17-76 



18-11 



16-84 



16-30 



15-92 



16-66 



[17-35] 



1916 



14-78 



[14-97] 



2 



20-89 



19-80 



17-64 



20-22 



17-59 



[16 



66] 



1701 



1810 



18-10 



16-49 



14-75' 



14-26 



3 



21-14 



18-15 



[17-35] 



19-08 



18-10 



16 



70 



16-28 



16-00 



17-33 



17-01 



[14-70] 



14-40 



4 



21-06 



[19-44] 



1707 



18-67 



17-66 



16 



88 



16-42 



[16-90] 



17-49 



16-70 



14-95 



15-33 



5 



21-24 



20-50 



1708 



18-05 



[17-82] 



16 



92 



16-91 



16-55 



17-62 



1600 



13-77 



14-10 



6 



20-98 



19-73 



17-43 



17-24 



18-53 



16 



80 



16-07 



16-57 



16-74 



[15-88] 



14-80 



14-57 



7 



[20-83] 



18-18 



17-85 



[18-17] 



17-49 



17 



01 



[16-74] 



17-50 



17-45 



15-06 



14-37 



14-57 



8 



20-29 



19-59 



18-33 



18-05 



17-53 



16 



03 



18-03 



18-16 



[16-99] 



15-32 



13-91 



[14-53] 



9 



20-32 



19-88 



17-73 



18-04 



18-28 



[16 



64] 



17-01 



1903 



16-50 



15-18 



13-78 



14-49 



10 



21-07 



18-64 



[18-01] 



18-99 



17-95 



16 



43 



15-98 



17-23 



16-90 



1519 



[14-15] 



14-73 



11 



21-53 



[19-31] 



. 1806 



17-70 



17-29 



16 



52 



16-48 



[17-74] 



16-74 



15-27 



14-33 



14-72 



12 



20-51 



19-31 



18-70 



18-68 



[17-51] 



17 



07 



16-24 



16-90 



16-59 



15-40 



13-92 



14-38 



13 



20-68 



19-34 



17-39 



18-40 



17-54 



17 



33 



16-77 



17-67 



16-89 



[15-07] 



14-61 



14-70 



14 



[20-86] 



19-08 



18-32 



[18-48] 



17-36 



16 



78 



[16-43] 



17-48 



17-01 



■ 14-48 



14-63 



14-65 



15 



20-61 



19-71 



18-05 



1811 



16-63 



16 



73 



16-69 



16-83 



[16-93] 



15-56 



14-80 



[14-42] 



16 



20-64 



19-23 



18-21 



17-75 



17-68 



[16 



92] 



1619 



17-22 



18-35 



14-51 



12-67 



13-99 



17 



21-17 



19-60 



[17-97] 



20-24 



17-73 



16 



22 



16-24 



17-08 



16-26 



14-93 



[14-24] 



14-51 



18 



20-89 



[19-15] 



17-91 



18-10 



17-36 



17 



26 



15-78 



[17-19] 



16-48 



15-76 



13-97 



14-27 



19 



20-63 



18-64 



17-68 



18-15 



[17-49] 



17 



23 



16-22 



17-32 



16-83 



14-77 



14-74 



14-46 



20 



20-06 



18-63 



17-67 



18-54 



17-79 



16 



38 



1619 



17-51 



16-25 



[15-61] 



14-63 



12-61 



21 



[20-61] 



19-11 



1807 



[18-19] 



17-47 



17 



01 



[16-00] 



17-18 



16-80 



18-16 



1508 



15-48 



22 



20-77 



18-69 



18-36 



18-24 



16-90 



16 



19 



14-91 



17-12 



[16-63] 



14-60 



14-33 



[14-13] 



23 



21-04 



18-56 



18-30 



18-10 



17-84 



[16 



25] 



16-72 



19-46 



17-34 



15-45 



13-38 



14-27 



24 



20-25 



18-33 



[18-01] 



1803 



16-89 



15 



80 



16-21 



17-62 



16-58 



' 14-29 



[14-51] 



13-90 



25 



22-83 



[18-13] 



18-18 



17-25 



16-55 



16 



48 



17-12 



[17-76] 



15-98 



13-50 



15-07 



14-05 



26 



20-25 



18-52 



17-88 



18-26 



[16-68] 



15 



64 



16-66 



17-17 



15-27 



14-31 



14-65 



14-23 



27 



19-01 



18-17 



17-29 



18-64 



16-17 



16 



38 



1719 



1715 



19-60 



[14-66] 



14-57 



1414 



28 



[20-10] 



16-50 



18-41 



[17-60] 



16-48 



16 



47 



[16-92] 



18-04 



17-52 



14-49 



15-86 



12-88 



29 



19-92 



17-15 



17-72 



18-00 



1618 



15 



94 



17-23 



17-23 



[17-82] 



1511 



1506 



[13-30] 



30 



19-30 





16-65 



16-64 



16-21 



[16 



33] 



15-19 



16-67 



18-91 



16-26 



14-93 



11-92 



31 



19-26 





[18-36] 





16-98 





18-15 



17-28 





15-14 





13-85 



Mean 



20-60 



18-93 



17-84 



18-28 



17-30 



16-58 



16-51 



17-36 



1710 



15-49 



14-47 



14-21 



As no observations were made on Sundays, the places which the means for Sundays would have occupied 

 have been filled up by the means of the three preceding and three succeeding days ; these means are therefore 

 weekly means, and may be considered as approximate means for the Sundays. They have been used in the 

 summations having reference to the Moon's position, as it was considered that the want of any means on these 

 days would affect the accuracy of the results more seriously than the use of the approximations. 



Mean Declination and the Secular Change. 



The mean westerly declination for the year 1844, 

 The mean westerly declination for the year 1843 (1843, p. 221), 

 Hence, the value of the secular change for the year 1843-4, 

 The secular change for the year 1842-3 (1843, p. 224), . 



= 25° l7'-06 



= 25 22-85 

 = -5-79 

 = -5-62 



We may therefore conclude that the yearly diminution of westerly declination was nearly constant from 

 1842 to 1844, or that the north extremity of the declination needle approached the true north at the average 

 rate of 5 ,- 70 a-year. 





L 



