PART III. : PERIOD OF THE TEMPERATURE SEICHE IF THE MADUSEE. 635 



„The uninodal period is 



t = 



2-n-a 



seconds 



j2g( P -p')K 



= 2ttx 10-43 xlO 10 



~ 3600 V2 x 981 x -0011 x 24-4 xlO 12 

 = 24 - 8 hours. 



hours 



§ 34. Another approximation to the period was made in the following manner. It 

 will be observed that the seiche normal curve is of the same general shape as the 

 temperature normal curve, save that in the former the sudden rise occurs nearer the left 



_Q_ 



TEMPERATURE NORMAL CURVE 



PARABOLIC APPROXIMATION 



SEICHE NORMAL CURVE 



NORMAL CURVES FOR THE MADUSEE 

 Fig. 5. 



end than in the latter. We may, however, consider the seiche normal curve as an 

 approximation to the temperature normal curve, and therefore the period of the 

 temperature seiche can be calculated from the period of the ordinary seiche. 

 If T is the period of the temperature seiche and t that of the ordinary seiche 

 rp _ t area of surface of separation / h of seiche normal curve 



area of free surface V h f temp, normal curve x (p - p) 

 35-5x167 



< / 5-65 

 V -0011 



hours 



60 x 295 

 = 24 hours. 

 TRANS. ROY. SOC. EDIN., VOL. XLVII. PART IV. (NO. 22). 



95 



