lii Inteoduction to the Makerstoun Obseevations, 1843. 



73. With the exception of the results of the values of = — V\, where the com- 



parisons have been of the readings on one day with those on, the next following, the 

 results are remarkably consistent for all intervals, and in no case does the result 

 amount to that by temperature experiments ; as an evidence, however, that the first 

 results differ from the others only accidentally, the following is given, which con- 

 tains all the comparisons made of the readings on one day with those on the day 

 immediately following, with the exception already mentioned for the balance magnet, 

 No. 68 :— 



Table 21. — Results of Comparisons with One Day's Interval. 



Period compared. 



No. of 

 comparisons. 



2 A t 



2 Ax 



9- 



1844. 

 May 9 — May 24 

 May 29 — June 28 

 July 17— July 31 

 Sept. 2— Sept. 25 

 Nov. 26— Dec. 13 



11 

 26 

 11 

 19 

 15 



884-8 

 1262-8 

 504-5 

 834-0 

 842-9 



Sc. Div. 



1792-6 

 1989-8 

 691-9 

 1551-9 

 1563-2 



Sc. Dlr. 



2-03 

 1-58 

 1-37 

 1-86 

 1-85 



All the Periods 



82 



4329-0 



7589-4 



1-85 



In this case it will also be remarked, that no partial result is as great as that 

 from the temperature experiments. 



74. As a farther evidence that the result obtained for this instrument is also 

 independent of any cause, such as has been already suggested for the balance needle, 

 the following Table contains the results of the comparisons on the same days as 

 those already given for the balance needle, and on which the differences of tempe- 

 rature depend on artificial heat : — 



Table 22 



. — Results of Comparisons when the Differences of Temperature 

 on Artificial Causes. 



depend 



Day of 

 com- 

 parison. 



Days compared with 



No. of 

 compa- 

 risons. 



2A(T) 



2A(0 



2A(x) 



Error of 

 coefficient. 



Resulting 

 coefficient. 



1843. 

 Jan. 23 

 Mar. 13 

 Mar. 14 

 Mar. 15 

 Mar. 22 

 Mar. 23 

 Oct. 19 

 Nov. 25 

 Dec. 21 



1843. 

 Jan. 18—21, 24—28 

 Mar. 16—21, 

 Mar. 16—21, 

 Mar. 16—21, 

 Mar. 16—21, 24—28 

 Mar. 16—21, 24—28 

 Oct. 14—18, 20—25 

 Nov. 21—24, 27— Dec. 1 

 Dec. 16—20, 22—27 



9 

 5 

 5 

 5 

 9 

 9 

 9 

 9 

 9 



+ 63-4 

 -21-2 



-27-5 

 -290 

 + 79-1 

 + 55-7 

 -41-2 

 -84-5 

 -49-9 



130 



28 

 26 

 28 

 62 

 79 

 99 

 97 

 83 



2 

 1 

 1 

 1 

 4 

 5 

 6 

 

 8 



Sc. Div. 



+ 36-3 

 -14-6 

 - 8-0 

 + 4-8 

 + 52-0 

 + 23-3 

 + 32-8 

 + 29-9 

 + 1-4 



Sc. Div. 



+ 0-29 

 -0-52 

 -0-31 

 + 0-17 

 + 0-83 

 + 0-29 

 + 0-33 

 + 0-31 

 + 0-02 



Sc. Div. 



1-61 

 2-42 

 2-21 

 1-73 

 1-07 

 1-71 

 1-57 

 1-59 

 1-88 



