518 Mr. R. Hosking on the 



Viscosity Values ( x 10 5 ) at 50° C. collected. 



Pressure. 



Tube I. 



Tube II. 



Tube III. 



Tube IV. 



Average. 



7'3 cm. 



553 



550 



551 



549 



551 



110 „ 



553 



549 



552 



547 



550 



14-7 „ 



551 



548 



552 



545 



549 



20 „ 



550 



549 



554 



546 



550 



24 „ 









554 



554 



25 „ 



551 







546 



549 



26 „ 









551 



551 



27 „ 



550 







549 



550 



29 „ 



551 



... 





(588) 



551 



30 „ 



550 



553 



(557) 



(593) 



551 



31 „ 



547 







(598) 



547 



33 „ 



549 









549 



34 „ 



551 







(668) 



551 



35 „ 



554 





(562) 





554 



36 „ 







(574) 



(709) 





37 „ 



(558) 





(571) 







38 „ 







(578) 



(751) 





39 „ 



(573) 



... 



(599) 







40 „ 



(591) 



(559) 



(612) 



(814) 





42 „ 



... 



(565) 









43 „ 

 Average = 



•« 







(837) 





•00551 



•00550 



•00552 



•00548 



Mean Value ='00550 



The values for the viscosity of: water at 50° C, obtained with 

 the various capillary tubes in the glischrometer, are collected 

 in the foregoing table. The mean value is '00550. 



Results. 



(1) The constants in the reduction formula were all deter- 

 mined with the greatest possible degree of accuracy, including 

 R, w, and m. 



(2) For each capillary in the glischrometer — four were 

 used separately — two values for m were found, one for each 

 of the ends. These values were in every case greater than 

 the theoretical value 1*12. 



(3) For the series of capillary tubes used, experiments at 

 temperatures 0° C, 25° 0., and 50° C. gave in each case 

 zero values for n. 



(4) Absolute values for the viscosity of water at 0° C, 

 26° C, and 50° C. were obtained, namely, '01793, '00893, 

 and '00550; which are probably correct to 0*1 per cent. 



