Capt . Parry and Lieut. Foster’s Observations on magnetic intensity. 125 
Abstract of the Results given in the preceding Table of Intensities. 
The following Table is an abstract of the preceding observations on the 
diurnal change of intensity of the horizontal magnetic needle, at Port 
Bowen, during the months of February, March, April, and May, in the 
year 1825. 
The second, third, fourth, and fifth columns of this Table, have been 
formed by dividing the sum of the times of vibration at each hour, for every 
month, by the number of days, for the mean monthly intensity at each 
hour ; and the last column is formed by dividing the sum of all the times, 
by the number of days, for a general mean result. In this, however, the 
observations made in May are not included, in consequence of the re-mag- 
netising of the needle, as stated at the head of the Table of that month’s 
observations. 
Monthly and general mean Intensities of the horizontal magnetic Needle for 
every hour. 
Hour. 
February. 
March. 
April. 
May. 
General mean 
independent 
of May. 
Mean time in per- 
forming 60 vib. 
Mean time in per- 
forming 60 vib. 
Mean time in per- 
forming 60 vib. 
Mean time in per- 
forming 60 vib. 
h. 
seconds. 
seconds. 
seconds. 
seconds. 
seconds. 
A. M. I 
1076,8 
1079,1 
1098,9’ 
916,4 
1086,6 
2 
1°7 3,5 
1083,1 
1 100,7 
1089,4 
3 
io 75>7 
1082,1 
1 102,7 
930,7 
1089,1 
4 
1080,7 
1084,8 
I 102,7 
1091,1 
5 
1082,5 
1082,8 
1101,7 
923,2 
1090,3 
6 
1082,1 
1082,4 
1105,4 
1090,6 
7 
1082,8 
1082,9 
1 108,2 
922,6 
1092,6 
8 
1082,9 
1083,1 
I 109,1 
1093,4 
9 
1080,9 
1084,7 
1 108,1 
9 2 7,5 
1094,2 
10 
J° 79>5 
1081,7 
1107,1 
1091,4 
1 1 
1077,9 
1081,9 
1 101,9 
923,6 
1089,0 
Noon 12 
1077,1 
I 077»4 
1093,3 
1084,6 
P. M. 1 
1075, 1 
1062,6 
1092,5 
9 H ,4 
1081,1 
2 
1072,7 
1062,6 
1 106,6 
1084,5 
3 
*° 77>9 
1076,4 
I I 10,2 
905,2 
1087,6 
4 
io 77»4 
1073,6 
1090,9 
1094,9 
5 
1073,6 
I0 73>4 
1094,0 
905,4 
1081,7 
6 
io 73>5 
1072,1 
1090,7 
1086,2 
7 
1074,2 
1072,0 
1089,2 
904,4 
1079,1 
8 
Io 73>8 
1074,0 
1088,7 
1 079,7 
9 
ic.75, 1 
1 074.5 
1091,2 
906,0 
1080,8 
10 
1073,8 
1074,8 
1092,1 
1081,3 
i 1 
Io 7 5 ,i 
io 75>9 
1093,3 
911,6 
1082,3 
Midnight 1 2 
1076,3 
1077,1 
1096,1 
1083,9 
From the general mean of the above results, it appears, that the maxi- 
mum intensity of the horizontal needle at Port Bowen, uniformly took 
place about 7 h P. M. ; but the time of minimum intensity is not so well 
defined, although it seems to happen somewhat later in the morning. 
