00 



the mechanics of the earth s atmosphere. 



The values of R and F are the same as in the first series. The follow- 

 ing values of Tc are computed from the reduced r : 



Table II. 



It evidently results that k becomes larger as soon as the surface of 

 the disk increases, as also that the differences are proportional, not to 

 the increase of the surfaces, but to the increase of the radii. 



Measures were also made with square disks whose sides measured 

 b= L', 3, 4, 5, 6 inches, respectively. These gave — 



The closer investigation showed again that the surfaces of the disks 

 in part needed some small corrections, as in the following Table III : 



Table III. 



The following results were given by a subsequent repetition of the 

 same observations : 



