74 THE FRESH-WATER LOCHS OF SCOTLAND 
recovery after the minimum is very gradual, and there is only a little 
wart corresponding to the peaks at the other two stations. 
It is interesting to notice that the minimum of the disturbance, 
although it destroys the configuration of the UB, and generates one 
of the best-marked BT-dicrotes observed, yet produces no great 
change in the total range of the seiche. It does produce a small rise 
of level at Picnic Point of 7 mm. to 11 mm. This is confirmed by 
the limnogram taken at the binode, where at that time the Sarasin 
was running at high speed (160 mm. per hour). This shows a rise of 
3^ 
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22 
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LOCH EAF^N JtFiuaNS ^.Cj OS'. 
Fig. 26. 
level of 5 mm., and a diminution in the range of the uninodal seiche 
of about 8 mm. 
At 14^ 13™ there is a sudden rise of level of about 14 mm., 
evidently due to the intense action of the maximum of pressure 
developed towards the western end of the lake, which there is nothing 
to counterbalance on the eastern part. It is after this point that the 
new BT configuration becomes conspicuous. As will be seen from 
the anemogram, the barometric and seiche disturbances at 14^ were 
associated with a very sudden rise in the average wind velocity from 
5 to 25 (mile/hour). 
