764 



DR E. M. WEDDERBURN AND MR A. W. YOUNG ON 



seiche. This was a period of calms and light winds, and hence from this part of 

 the curve we can get an idea as to the decay of the uninodal temperature seiche in 

 Loch Earn. 



TABLE VII. 



Time. 



No. 



0. 



1. 



2. 



3. 



4. 



Aug. 24, 21 h. . 



1-24 



14-42 

 14-90 



2-03 

 1-93 



304 

 305 



1-97 

 3-15 



185° 

 172 



1-19 

 2-12 



312° 



#00 



0-55 



267* 



329 



25, 17 h. . 



25-48 



15-32 

 15-58 



3-64 

 3-74 



323 



322 



1-56 

 1-90 



193 

 181 



0-32 

 0-54 



261 



276 



024 

 0-39 



237 

 .750 



26, 13 h. . 



49-72 



15-79 

 16-02 



2-34 



2S7 



355 



347 



100 

 1-45 



158 

 168 



0-76 

 1-08 



61 



0-17 

 0-75 



14 



550 



27, 9h. . 



73-96 



15-23 

 15' m 



0-89 

 0-95 



18 



12 



074 

 1-15 



144 

 149 



0-49 

 0-72 



77 

 69 



0-30 

 0-37 



166 







28, 5h. . 



97-120 



14-17 

 14-26 



0-44 

 0-97 



348 

 334 



0-63 

 0-77 



129 

 137 



035 



0-14 



108 

 135 



o-io 

 0-14 







.75 



Aug. 25, 7h. . 



13-36 



14-87 

 15 23 



2-58 

 2-65 



146 

 140 



1-25 

 1-88 



167 

 148 



026 

 0-56 



59 



0-15 

 0-.&S 



106 



26, 3h. . 



37-60 



16-35 



16-U 



334 



3-22 



161 

 155 



1-20 



1-44 



198 

 186 



0-44 



0-28 



234 



248 



022 



0-57 



240 

 201 



23 h. . 



61-84 



15-56 



15-75 



1-66 

 1-80 



166 



I64 



MS 



V69 



187 

 185 



0-58 

 0-97 



248 



0-24 

 0\£5 



277 

 299 



27, 19 h. . 



85-108 



14-53 

 15-09 



081 

 1-10 



132 



109 



0-66 



1-04 



147 



144 



037 



0-43 



292 

 07.7 



0-18 

 0-71 







348 



28, 15 h. . 



109-132 



13-79 

 14-07 



0-58 

 0-95 



89 

 117 



0-36 

 37 



159 



160 



0-27 



294 



289 



0-15 



0-30 



312 



303 



The dotted curve refers to the station nearer the end of the loch, and, as would 

 be expected, the amplitude there is greater than at Station 2. If we were to assume 

 that the isotherms lie in planes through the uninode as marked on the map, the 

 amplitude at Station 1 would be 1 '14 of that at Station 2. The actual ratio is about 

 1'04, indicating that the gradient of the isotherm diminishes towards the end of the 

 loch. This may be due to the great amplitude of the oscillation and the damping 

 effect of shallow water, or to the fact that the temperature normal curve is not 

 parabolic, for it is only with parabolic normal curves that the isotherms can remain 

 as planes. 



2. Variation of Uninodal Phase. — This curve is drawn by taking as vertical 

 scale the angle of the phase, and as the horizontal scale the mid-times of the groups. 

 Daring the first 60 hours (or three groups) the phase is seen to be uniformly 



