370 



Results of Makeestoun Obseevations, 1844. 



TABLE XXXVI. — Mean Difference of a Single Observation of the Bifilar Magnetometer from the 

 Monthly Mean at the corresponding hour, for each Hour in each Month of 1844. 



Mak. 

 M. T. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



i. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



12 



2-81 



317 



8-12 



5 



•95 



4-44 



2-49 



2-63 



3-80 



4-92 



4-01 



4-43 



4-48 



13 



1-86 



4-45 



12-89 



3 



67 



4-14 



213 



2-67 



4-95 



4-26 



3-85 



3-32 



2-68 



14 



1-86 



5-00 



10-96 



4 



19 



4-41 



203 



2-07 



3-93 



4-69 



4-71 



3-93 



4-67 



15 



1-81 



3-72 



7-33 



6 



28 



5-00 



2-36 



2-64 



3-66 



3-58 



2-92 



2-65 



4-80 



16 



206 



4-28 



5-42 



3 



70 



4-84 



2-42 



2-91 



3-16 



3-62 



4-03 



2-79 



3-45 



17 



1-83 



2-47 



9-59 



5 



64 



305 



2-78 



313 



3-89 



3-98 



7-32 



4-83 



3-34 



18 



2-06 



2-18 



3-37 



3 



78 



3-23 



2-99 



303 



3-69 



4-70 



5-73 



3-89 



3-23 



19 



1-79 



2-85 



4-24 



5 



39 



309 



2-94 



3-56 



4-44 



4-50 



4-73 



3 11 



2-92 



20 



2-03 



219 



4-63 



6 



97 



3-56 



219 



4-44 



5-53 



3-90 



6-23 



3-88 



3-08 



21 



2-31 



3-36 



4-68 



7 



80 



3-78 



2-36 



3-38 



4-88 



3-93 



6-88 



4-55 



3-42 



22 



2-89 



3-89 



4-86 



5 



94 



4-76 



3-09 



4-01 



3-84 



4-93 



7-54 



4-32 



3-82 



23 



2-03 



4-51 



4-45 



5 



69 



3-41 



3-90 



3-59 



4-00 



4-39 



5-41 



4-60 



3-42 







2-53 



3-88 



3-21 



5 



92 



406 



4-34 



3-81 



4-65 



5-72 



3-59 



3-60 



318 



1 



2-85 



2.89 



3-80 



4 



17 



3-99 



3-61 



4-75 



4-38 



3-82 



2-65 



3-42 



2-81 



2 



2-21 



2-40 



4-00 



5 



10 



4-16 



3-60 



4-33 



4-65 



4-35 



3-66 



312 



2-89 



3 



2-84 



2-64 



2-92 



7 



94 



4-53 



2-87 



6-04 



5-41 



3-55 



4-60 



3-56 



4-25 



4 



1-84 



3-14 



3-08 



6 



49 



4-07 



3-71 



4-67 



7-58 



5-10 



4-27 



5-02 



5-22 



5 



2-50 



4-18 



4-65 



9 



32 



3-75 



3-23 



2-95 



5-65 



4-13 



419 



5-74 



4-27 



6 



3-20 



3-84 



4-43 



6 



84 



5-00 



2-92 



4-05 



5-83 



2-86 



4-23 



4-81 



4-23 



7 



4-13 



3-68 



4-89 



3 



99 



4-41 



2-26 



3-18 



4-84 



4-75 



5-68 



5-46 



4-52 



8 



3-76 



5-10 



5-27 



4 



07 



3-70 



2-06 



2-37 



4-06 



4-58 



5-83 



413 



3 21 



9 



3-33 



7-06 



7-48 



4 



42 



3-48 



2-96 



2-06 



4-72 



3-78 



6-53 



5-42 



3-75 



10 



2-81 



5-43 



10-10 



3- 



75 



403 



304 



2-10 



3-73 



2-93 



4-62 



6-32 



3-58 



11 



2-56 



6-49 



6-69 



4-88 



4-61 



2-31 



211 



5-33 



3-57 



4-98 



4-27 



409 



TABLE XXXVII. — Mean Difference of a Single Observation of the Bifilar Magnetometer from the 

 Monthly Mean at the corresponding hour, for each hour in each of the Astronomical Quarters, 

 and in the Year 1844. 



Mak. 



Nov. 



Feb. 



May. 



Aug. 



1 



Mak. 1 



Nov. 



Feb. 



May. 



Aug. 





M T 



Dec. 



March. 



June. 



Sept. 



Year. 



1 

 M T 



Dec. 



March. 



June. 



dept. 



"iear. 





Jan . 



April. 



July. 



Oct. 







Jan. 



April. 



July. 



Oct. 



So. Div. 



h. 



Sc. Div. 



Sc. Div. 



So. Div. 



Sc. Div. 



Sc. Div. 



h. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



12 



3-91 



5-75 



319 



4-24 



4-27 







310 



4-34 



4-07 



4-65 



4-04 



13 



2-62 



7-00 



2-98 



4-35 



4-24 



1 



3-03 



3-62 



4-12 



3-62 



3-59 



14 



3-49 



6-72 



2-84 



4-44 



4-37 



2 



2-74 



3-83 



4-03 



4-22 



3-71 



15 



309 



5-78 



3-33 



3-39 



3-90 



3 



3-55 



4-50 



4-48 



4-52 



4-26 



16 



2-77 



4-47 



3-39 



3-60 



3-56 



4 



403 



4-24 



4-15 



5-65 



4-52 



17 



3-33 



5-90 



2-99 



5-06 



4-32 



5 



4-17 



605 



3-31 



4-66 



4-55 



18 



3 06 



311 



3-08 



4-71 



3-49 



6 



4-08 



5-04 



3-99 



4-31 



4-35 



19 



2-61 



4-16 



3-20 



4-56 



3-63 



7 



4-70 



4-19 



3-28 



509 



4-32 



20 



300 



4-60 



3-40 



5-22 



405 



8 



3-70 



4-81 



2-71 



4-82 



4-01 



21 



3-43 



5-28 



3-17 



5-23 



4-28 



9 



4-17 



6-32 



2-83 



501 



4-58 



22 



3-68 



4-90 



3-95 



5-44 



4-49 



10 



4-24 



6-43 



3-06 



3-76 



4-37 



23 



3-35 



4-88 



3-63 



4-60 



4-12 



11 



3-64 



6-02 



301 



4-63 1 



4-32 



Diurnal Variation of the Mean Difference. — The mean difference is a maximum twice and a minimum 

 twice in the day, in the variations for the year. The greatest mean occurs at 9 h 10 m p.m., but the greatest mean 

 of two consecutive hours is that for 4 h and 5 h p.m. : the interpolated epochs are as follow : maxima at 4 h 40 m 



