78 
ARCHDEACON PRATT ON THE ATTRACTION OF THE 
attracted station of the middle points of the compartments of each lune, these 
distances being taken from the third column of numbers in art. 25 and 28. By 
laying the slip along the middle line of the lune, with one end at the station, with 
the greatest ease I dotted down on the map the centres of the compartments, and 
then by an inspection of the heights, recorded on the map, of ranges and especially 
of the beds of rivers, determined the average height of the mass on each compart- 
ment above the level of Station A. In using the diagram fig. 5, I counted the 
number of centres of compartments which occur, and marked the heights of the first 
and last lying on the slope, whence by summing an arithmetic series I obtained the 
sum of the whole heights, without taking the trouble of noting each of them down. 
The result of these measures is given in the following Tables. Hi and Hg represent 
the sums of the heights in miles in the Known and Doubtful Regions. The line E at 
the bottom of each gives the correction which should be applied to the values of 
H sin ^|3 cos Az, in any given lune, for either the Known or Doubtful Region, if the 
heights in that lune are all increased or diminished by 100 feet. ’ 
Table I. — Station A. (Kaliana), Known Region. 
Heights of the masses in 
the compartments above A. 
Lune I. 
Lune 11. 
Lune III. 
Lune IV. 
Lune V. 
h, 
h 2 
Jt ^ 
1l\ 
500 feet 
600 feet 
600 feet 
600 feet 
1200 feet 
300 feet 
500 feet 
1500 feet 
800 feet 
300 feet 
h. 
300 feet 
800 feet 
1500 feet 
1500 feet 
300 feet 
h g 
500 feet 
1000 feet 
1200 feet 
1600 feet 
300 feet 
h, 
800 feet 
2000 feet 
600 feet 
1600 feet 
800 feet 
h g 
1300 feet 
3000 feet 
2000 feet 
1800 feet 
1000 feet 
2300 feet 
3000 feet 
2500 feet 
2500 feet 
1500 feet 
^^10 
1800 feet 
5000 feet 
3000 feet 
6000 feet 
2000 feet 
7*11 
300 feet 
2500 feet 
5500 feet 
7000 feet 
2500 feet 
800 feet 
4000 feet 
7000 feet 
7000 feet 
3000 feet 
^13 
800 feet 
4000 feet 
8500 feet 
9000 feet 
2500 feet 
4i4 
800 feet 
5000 feet 
9500 feet 
9000 feet 
2500 feet 
800 feet 
5500 feet 
9000 feet 
9000 feet 
2500 feet 
800 feet 
6000 feet 
9500 feet 
9000 feet 
2500 feet 
1300 feet 
7000 feet 
9500 feet 
9500 feet 
2500 feet 
K 
1 800 feet 
7500 feet 
9500 feet 
9500 feet 
3000 feet 
2800 feet 
8300 feet 
9500 feet 
9500 feet 
3000 feet 
K 
4800 feet 
9500 feet 
9500 feet 
9500 feet 
3000 feet 
Sum = 
22,000 feet 
74,600 feet 
100,400 feet 
106.200 feet 
33,500 feet 
Hi= 
4'l67 miles 
14*129 miles 
19*015 miles 
20*114 miles 
6*344 
miles 
HiSini/3= 
0‘866 mile 
3*656 miles 
4*921 miles 
5*202 miles 
1*163 
mile 
H, sin -B cos Az. = 
0’772 mile 
3*656 miles 
4*262 miles 
2*602 miles 
0*095 
mile 
Hj sin - /3 sin Az. = 
— 0'393 mile 
0*000 mile 
2*460 miles 
4*223 miles 
1*057 
mile 
E- 
0‘05614 mile 
0*08331 mile 
0*08066 mile 
0*04901 mile 
0*00515 mile 
