288 Mr. O. M. Mitchel on the Velocity of the 



exhibit the character of the records. The shght variations 

 are due, doubtless, to want of absolute uniformity in the con- 

 nexions. The variations are, however, very slight, and dis- 

 appear in the mean of a group of thirty observations. The 

 measures follow. 



The mean values of the intervals are as follows : — 



Correction for non-radiation. 

 s s s 



No. 1, long circuit, interval =0-0568 — 0-0110 = 0-0458 

 No. 2, short ... =0-0399-00145 = 0-0254 



No. 3, long ... =0-0633 — 0-0l65 = 0-0468 



No. 4, short ... =0-0444- 00195 = 0-0249 



No. 5, long ... =0-0682-0-0215 = 0-0467 



