Hexkessy — On the JSLoleciiJav Influence of Fluids. 



Ql 



pending fibre had been properly centred, both disks were found at 

 180° distance. The clock having been previously wound up, it was 

 now set in motion. When the rate was one turn in four hours, it was 

 easy to observe the positions of the disks at short intervals as well as 

 after stopping the clock at the end of a few hours. In this way a 

 small angle of deviation of the disks with reference to the cylinder 

 would be instantly detected. As the arrangement permitted the 

 placing of the disks at different distances from the axis of rotation, 

 the position of the centre of each disk was accurately measured before 

 each experiment. In all the recent experiments with veiy slow rota- 

 tion, I have employed distilled water, and the temperature of the room 

 was maintained by hot water arrangements nearly constantly at about 

 62° Fahrenheit. 



ExPEJBESraXTS WITH SlOAV EoTATIOir. 



I No. 



2 hours. 



51 mins. 



4 hours. 



11 hours. 

 4 hours. 

 1 hour. 



10 hours. 

 1 hour. 



Ihr. 40Tm'n. 



3 hours. 



Distance of centi-e disks 

 from the axis of rotation, 

 9 centimetres, 



Disks at the same dis- 

 tance, 



Disks at the same distance 

 fiom axis, . . 



Disks at 6 centimetres 

 fi-om axis of suspension, 



Disks at 4 centimetres 

 from the axis, 



Disks at 9 centimetres, . . 



Disks at 6 centimetres, . . 



Disks at 6 centimetres, . . 



A. 



B. 



316" 



316' 



314 



314 



316 



316 



316 



316 



316 



316 



348* 



349 



349 



349 



90 



90 



106 



105 



86 



85* 



83 



83 



V. of E. 



1 turn in 

 4 hoiu's. 



1 turn in 2 hrs. 



36 min. 

 Same velocity. 



T. means duration of experiment. A. position of index at the heginning, B. at 

 the end. V. of R. velocity of rotation of the containing vessel. 



Of the experiments with rapid rotations, the only result which, 

 I think, may be mentioned, is one bearing upon those obtained from 



