622 



MR E. M. WEDDERBURN ON THE TEMPERATURE SEICHE. 



§ 6. Observations, when possible, were made three or four times a day at each station, 

 — readings of temperature being made for each metre of depth except when the tem- 

 perature gradient was very small. From 8 a.m. on 30th July to 8 p.m. on 31st July 

 at Moritzfelde and Werben, and to 8 a.m. on 1st August at Seelow, observations were 

 made at intervals of two hours, and again from 8 a.m. on 9th August to 6 p.m. on 12th 

 August two-hourly observations were made at Moritzfelde and Werben. As the results 

 being obtained were interesting, the observations were continued for other two days at 

 Moritzfelde at intervals of three hours. The night observations in a small boat were 

 very trying to the observers, and they deserve all credit for what they accomplished. 

 During the three weeks' observations more than 3000 temperature readings were made. 



§ 7. During the greater part of the time the winds were light. From 24th to 27th 

 July they were of moderate strength and from a southerly or south-westerly direction. 

 From 28th July to 4th August there were calms, with occasional breezes of moderate 

 strength and of variable direction. During this period the winds frequently blew from 

 the north-west in the morning and veered round through north to north-east in the 

 course of the day. On 5th August there was a westerly to north-westerly breeze of 

 moderate strength, and north-westerly winds continued till 11th August. Except on 

 7th August (on which day no observations could be taken at Werben) they were always 

 of moderate strength. On the evening of 12th August a strong S.S. W. wind commenced 

 and continued to blow till about 6 p.m. on the 13th. On 14th August there was calm. 

 Professor Halbfass had with him a small hand wind-gauge, and the following are 

 some of the wind velocities recorded by him. The amount of cloud is also indicated in 

 the table. 



Date. 



Max. Wind Velocity in 

 Metres per Sec. 



Cloud. 



July 25 

 „ 26 



S.W. (stormy) 

 S.W. 4 



Dull. 





„ 27 



S.W. 4 



n 





„ 28 



N.E. 1-2 



Cloudless. 





„ 29 



N.E. 1-3 (mostly calm) 



a.m. cloudless; p.m. 



dull. 



„ 30 



Calm 



Clouds - 5. 





„ 31 



S.W. 3 (mostly calm) 



Cloudless. 





Aug. 1 



Calm 



Overcast. 





„ 2 



W. 3 (mostly calm) 



Clouds '5. 





„ 3 



W. 3 



A.M. cloudless ; p.m. 



overcast. 



„ 4 



N. 2 ; S.W. 5 



Overcast. 





„ 5 



W.S.W. 5; N.W. 5 



ji 





., 6 



N.N.E. 3 



Clouds 5. 





„ 7 

 „ 9 



Stormy, N.W. 

 N.-N.W. (strong gusts) 

 N.W. 6 



Overcast. 



!> 





„ io 



N.N.W. 5 



>> 





„ 11 



N.N.W. 4 (mostly calm) 



Clouds '5. 





., 12 



Variable 



)j 





„ 13 



., 14 



S.S.W. (strong) 

 Variable — calm 



Overcast. 

 Bright. 





