Introduction to the Makeestoun Observations, 1843. 
Table 1. — Values of one of the Long Scale Divisions. 
Observer B. 
Observer W. 
Scale 
Division. 
Mean of 
three 
Verniers. 
Scale 
Division. 
Mean of 
three 
Verniers. 
Value of 
one 
Division. 
Scale 
Division. 
Mean of 
three 
Verniers. 
Scale 
Division. 
Mean of 
three 
Verniers. 
Value of 
one 
Division. 
160 
O / ft 
55 18 46-25 
260 
o / // 
54 11 34-17 
0-67201 
180 
54 59 9-17 
280 
° > // 
53 51 51-25 
0-67300 
170 
55 12 4-17 
270 
54 4 50-21 
67233 
190 
54 52 22-50 
290 
53 45 7-50 
67250 
180 
55 5 20-83 
280 
53 58 2-50 
67305 
200 
54 45 38-33 
300 
53 38 25-00 
67222 
1st series, observer B ; one long scale division = 0'-67247 
2d series, observer W ; = 0'-67257 
The adopted mean value of one division of the long scale of 500 divisions = 0'-6725.* 
Auaf. 5. 1843. A short series of observations was made to determine the value 
of one division of the short scale of 300 divisions. 
Three verniers read ; measures of 50 divisions ; one division of the short scale 
f 0'-7504 \ \ f B. 
= i 0'-7502 ) ; observer [w. 
Nov. 29. 1843. Two series of observations were made with one vernier. The 
readings in the following Table are the means of the readings by Mr Welsh and 
myself. 
Table 2. — Values of one of the Short Scale Divisions. 
First Series. 
1\ 
Second Series 
3 h . 
Scale 
Division. 
Vernier B. 
Scale 
Division. 
Vernier B. 
Value of 
one 
Division. 
Scale 
Division. 
Vernier B. 
Scale 
Division. 
Vernier B. 
Value ol 
one 
Division. 
o / // 
O / ff 
O f ii 
O / // 
40 
55 26 56-5 
90 
54 49 27-5 
0-74967 
130 
54 11 28-0 
180 
53 34 2-5 
0-74S50 
50 
55 19 26-0 
100 
54 41 57-5 
74950 
140 
54 3 58-5 
190 
53 26 31-0 
749(12 
60 
55 1 1 56-0 
110 
54 34 27-5 
74950 
150 
53 56 30-0 
200 
53 19 2-5 
74902 
70 
55 4 3-0 
120 
54 26 52 0 
75267 
160 
53 48 55 0 
210 
53 11 35-0 
74667 
80 
54 56 55-5 
130 
54 19 23-5 
75050 
170 
53 41 32-5 
220 
53 4 3-5 
74967 
1st series ; one division of the short scale of 300 divisions = 0-7504 
2d series ; = 0'7486 
The adopted value of one division of the short scale = 0'-7500. 
* Tho differences in the partial results, it is believed, are not due to errors of graduation of the 
scale, as different comparisons give different results. If greater accuracy could he gained in the read- 
ings of the horizontal circle, it is obvious that tho mean of the angle subtended by one or two hundred 
BCale divisions ought not to be taken as tho value of the angle subtended by one scale division. 
