kept for some time in large Reservoirs. 



29 



Fifth Experiment, same date and place. 

 Covered reservoir. Probe at an^le about 70°. 



Sixth Experiment, same date and place. 

 Large reservoir. Probe at angle about S0'\ Tried at 2^ p.m. 



Jo. Temp. 



(appt.) S. G. 1070 

 1070 

 1069 

 1067 

 1064 

 1064-5 

 1057 

 1056 

 1050 

 1050-5 



(not full). 



1050 



