Prof. J. Perry on Liquid Friction, 453 



Tabxe VII.— March 22nd, 1892. (7 = 5-425 centim.) 



0°C. 



m. 



D. 



y- 



[i. 



56 



38 



49-5 



7-92 





55 



42 



59 



920 





55 



54 



72-5 



11-31 





56 



58 



88 



14-13 





56-5 



74 



116 



18-79 





57-5 



108 



158 



2632 





58-5 



29 



34 



5-78 





56 



24 



25 



4-01 



•1282 



57 



17-5 



11 



1-81 



•0791 



57 



15-5 



14 



2-31 



•1143 



54 



15-5 



12 



1-82 



•0903 



55 



16 



14 



2-19 



1054 



y means D/(/ + X) corrected to 56° C. by a correction of 

 2J per cent, per degree. The critical speed is probably below 

 n =24, and for speeds greater than the critical y an 1 " 32 nearly. 

 For speeds less than this the average value of p is 0*103. 

 According to (9) the value of jul for 56° 0. is 0*1055. 



Plotting logy and log?i as the coordinates of points on 

 squared paper gives points which may be said to lie on two 

 straight lines, but the errors of observation are too great. 

 For ft>24 we might perhaps say that y ocn 1 " 28 ; but it seems 

 hardly fair to draw conclusions from this set of observations. 



Table VIII.— March 24th, 1892. (/ = 7*025 centim. 



e°G. 



n. 



D. 



y- 



fi. 



30 



100 



363 



45-24 





30-8 



78 



250 



31-79 





31 



115 



404 



51-64 





31 



32 



62 



7-92 



1903 



31 



22 



47 



6-01 



•2103 



31 



17 



37 



4-73 



•214 



32 



13 



29 



3-80 



•2249 



31 



11 



23-5 



300 



•2097 



30 



9-2 



20 



2-50 



•209 





- y is D/(/ + X) corrected to 31° C. by a correction of 2^ per 

 cent, per degree. The numbers of the last column have no 

 meaning for speeds higher than n about = 32. The average 

 value of fjb is 0*210. According to (9) the value of ft for 

 31° C. is 0*216. 



Below ?? = 32, yotft, Above ft =32, we may perhaps say 



that 



(Xn 



1-4 



