Viscosity of Water. 



517 



(50 per cent, of the viscosity ; and for Tube IV. when the 

 pressure is 27 cms. and the second term is nearly 60 per cent, 

 of the viscosity, the deduced value is satisfactory, but an 

 increase of pressure of 1 cm. brings about some decided 

 change. The highest velocity reached in both cases, before 



Results at 50° C. with Tube IV. in Glischrometer. 



Pressure 



(h) 

 (Approx.). 



Time of 

 Flow (T) 

 (Approx.). 



Second 

 Term 

 X 10\ 



Viscosity 

 (double 



readings) 

 11 X 10"'. 



Viscosity 

 (mean) 

 7] x 10 s . 



7*3 cm. 



61'5 sec. 



123 



/5461 

 1552/ 



549 



11 » 



46-3 „ 



162 



(5471 

 1 547 f 



547 



15 „ 



37'5 ,, 



201 



J 545] 

 1 547 J 



545 

















fEKl 





20 „ 



28-1 „ 



268 



J 546 1 



1 546 J 



510 



24 „ 



25-3 „ 



297 





554 



25 „ 



244 „ 



308 



T546 1 

 1 540 ? 



546 



26 „ 



23-8 „ 



316 



551 



27 „ 



232 „ 



325 



(5501 

 l548| 



549 



28 „ 



22-7 „ 



332 





556 * 



29 „ 



QO.fi 



333 





588 * 



30 „ 



22-3 „ 



339 





593* 



31 „ 



21-9 „ 



343 





598* 



32 „ 



219 „ 



344 



... 



634 * 



34 „ 



21-5 „ 



350 





668* 



36 „ 



21-2 „ 



355 





709* 



38 „ 



210 „ 



359 





751* 



40 „ 



210 „ 



359 



f8221 



806 r 



814* 



44 „ 



202 „ 



373 



{ii} 



837* 



Mean -00548 



the change, was about 340 cms. per sec. The curves in 

 fig. 5 (PI. XIII.) indicate that when the change takes place, 

 there is a large increase in the value of m, if the formula 

 still holds; but the individual results do not agree sufficiently 

 well to enable one to draw definite conclusions from them. 



