ON THE SEICHES OF LOCH EARN. 



487 



obtained by contrasting the limnograms taken simultaneously on Loch Tay at Killin, 

 and on Loch Earn at Lochearnhead. The period of the microbaric disturbance is 

 about 29 m ; and it will be observed that it greatly increases the uninodal seiche of 



Z 



CM. 



KjQiAPtfrttam; /6 q OS. 



.a 



/ Hrs 



A 



cm j!ayrhU Pcimt /6.qos: 



/ Hrs 



3 



Fig. 15. 



Tay, the period of which is about 28 , 4 m . Indeed, the uninodal thus produced was 

 the best we found on Tay. On the other hand, this strong barometric disturbance 

 produces little or no eifect on the smooth UB-dicrote which was in progress on Earn, 

 because the periods of its components are 14"52 m and 8"09 m . 



/ Hrs 





KaAAasti, H5-/Q-OS. 



%.-*«> 



3 \-CM. 



&oohw*xA/rvf%exxMj ZS~< /<? o^ 



-/v/ 



$ 



2, 



/.Hrs 



3\-cm. 



KoUorb 2S/0 05~. 



"X 



'Hrs 



S~ 



7 



Fig. 16. 



As further examples of this kind, we may also mention the following observations :— 

 25tfi October, 3 h -8 h (fig. 16).— Microbaric disturbances of period 7'5 m to 8-0 r 

 brought out the binodal of Earn (T 2 = 8-09 m ) and the quadrinodal of Tay (T 4 = 8'6 m ). 

 TRANS. ROY. SOC. EDIN., VOL. XLVI. PART III. (NO. 20). 74 



