506 



Mr. R. Hosking on the Viscosity of Water. 



will intersect the axis 

 origin, and make with 



of ordinates at a distance C from the 

 the axis of abscissae an angle whose 



tangent is c. When c has been obtained m is deduced by 



means of equation (4). 



Equation (3) may be written in the form 



Ctt?R 4 _ 



Vt 



(i+«S 



The left-hand side of the equation will have different values 

 for different capillaries in the glischrometer. 

 Calling the left side K we have 



K = Vt + n Vt R/L or K = i/* + ZR/L, . . (5) 

 where l = nr) t « 



This is the equation of a straight line such that if values 

 of R/L be taken as abscissae, and corresponding values of 

 K as ordinates, the line passing through such points will 

 intersect the axis of ordinates at a distance rj t from the 

 origin, and make an angle with the axis of abscissae whose 

 tangent is k. From the value of k obtained in this way, n is 

 at once deduced. 



Typical Observations with Tube I. in Glischrometer. 



Temp. 



(*° C). 



Manometer 



Temp, of 



Time of 



Bulb 



phT 



1 _ 



Reading (h) 



Manometer 



Flow (T) 



being 



(reduced to 



cms. 



° 0. 



sees. 



emptied. 



50°) X 10-3. 



T 



{ 50-05 



*108-29 



22-9 



71-38 



E 



7-713 



•01401 



J 50-03 



108-27 



55 



71-46 



L 



7-718 



•01400 



1 50-00 



108-31 



55 



71'45 



R 



7-707 



•01400 



[50-00 



108-31 





71-33 



L 



7-697 



•01402 



f 50 10 

 \ 50-10 



150-28 



26 : 



54-34 



R 



8-145 



•01840 



150-30 





54-37 



L 



8-150 



•01839 



f 50-00 

 1 50-00 



19620 



22-9 



43-98 



R 



8-598 



•02274 



196-14 



JS 



43-74 



L 



8-546 



•02286 



1 50-00 

 [ 50-00 



196-10 



24-2 



4403 



R 



8-600 



02272 



196-17 



») 



43-70 



L 



8-540 



■02288 



f 50-04 



1-20-30 



23-9 



33-58 



R 



9-239 



•02978 



J 50-03 



20-30 



9J 



33-52 



L 



9-220 



•02984 



j 50-02 

 [5001 



20-30 



55 



33-58 



R 



9-236 



•02978 



20-30 





33-53 



L 



9-232 



•02985 



J 50-10 



25-40 



26 ! 



28-35 



R 



9-764 



•03527 



1 50-10 



24-40 



, 



29-24 



L 



9-674 



•03420 



f 50-05 



30-3S 



23-9 



24-78 



R 



10-204 



•04035 



1 50-06 



30-38 





24-93 



L 



10-267 



•04011 



1 50-07 

 I 50-08 



30-38 





24-72 



R 



10-184 



■04045 



30-38 



„ 



24-95 



L 



10-280 



•04008 



f 50-00 



35-40 



22-9 



22-32 



R 



10-701 



•04480 



J 5000 



3540 





22-38 



L 



10-726 



•04468 



1 50-00 



35-40 



55 



22-28 



R 



10-683 



•04488 



[50-00 



35-40 





22-38 



L 



10-726 



•04468 



r 50-io 



50-10 



50-10 



[50-10 



40-40 



22-9 



20-36 



R 



11-171 



•04912 



40-40 



„ 



21-40 



L 



11-737 



•04673 



40-40 





20-39 



R 



11-188 



•04904 



40-40 



» 



21-40 



L 



11-737 



•04673 



Water Manometer. 



t Mercury Manometer. 



