ON ATMOSPHERIC WAVES. 39 
rior slope extended from Alten to Lougan, the crest transiting Alten, 
ile the anterior trough passed Lougan; and second, when the posterior 
Fig. 1. : 
November 1842. 
9 
30°50 30°50 
30°00 30°00 
29°50 
29°50 
“ Alten 
29°00 = 29°00 
Opposite barometric curves at Alten and Lougan. 
Points of opposition, Noy. 3, maximum, Alten. 
“ rf Nov. 3, minimum, Lougan. 
re # Noy. 9, maximum, Lougan. 
” i Nov. 9, minimum, Alten (?) 
pe covered the area, the crest having arrived at Lougan, at which time in 
probability the posterior trough was vertically over Alten. The decided 
pposition of the curves also enables us to determine with considerable preci- 
n all the elements of the wave. It appears highly probable that the two 
bordinate maxima of the 8th and 10th in the Alten curve resulted from | 
ves in the trough of this Scandinavian wave, and that its true minimum 
curred on the 9th; this would give nearly equal intervals for the trans- 
ion of the anterior slope and crest from Alten to Lougan, the posterior 
pe on the 9th stretching from Lougan to Alten. Upon this supposition 
ave the following elements :— 
Of the great Scandinavian Wave a. 
Designation, a. 
Direction of crest W.S.W. —E.N.E. 
Extreme points, anterior slope, Lougan, Alten. 
Semi-amplitude from anterior slope, 1592 miles. 
Extreme points, posterior slope, Alten, Lougan. 
Semi-amplitude from posterior slope, 1592 miles. 
Epoch of anterior trough, Lougan, Nov. 3. 
» > crest Alten, aes 
” ” Lougan, ,, 9. 
»» Posterior trough, Alten, ,, 9, 
