| for Air | ||
|---|---|---|
| .00018227 | Rapp, Capillary-tube method, 1913 (Phys. Rev., II, 363). | |
| .00018257 | Gilchrist, Constant deflection method, 1913 (Phys. Rev., I, 124). | |
| .00018229 | Hogg, Damping of oscillating cylinders, 1905 (Proc. Am. Acad., XL, 611) | |
| .00018258 | Tomlinson, Damping of Swinging Pendulum, 1886 (Phil. Trans., CLXXVII, 767). | |
| .00018232 | Grindley and Gibson, Flow through pipe, 1908 (Proc. Roy. Soc., LXXX, 114). | |
| Mean | .00018240 |
It will be seen from Table IX that every one of the five different methods which have been used for the absolute determination of
for air leads to a value that differs by less than one part in one thousand from the following mean value,
. It was concluded, therefore, that we could depend upon the value of
for the viscosity of air under the conditions of our experiment to at least one part in one thousand. Very recently Dr. E. Harrington[48] has improved still further the apparatus designed by Dr. Gilchrist and the author and has made with it in the Ryerson Laboratory a determination of
which is, I think, altogether unique in its reliability and precision. I give to it alone greater weight than to all the other work of the past fifty years in this field taken together. The final value is