H2 OSCILLATIONS OF A VISCOUS SOLID 



as the first quarter of a simple harmonic motion, the following 

 results are obtained : 



1 0-950 0-804 0-578 0-293 0-0 

 1 0-948 0-795 0-568 0-280 O'O 



the first row giving the calculated values. If it were repre- 

 sented as a decaying simple harmonic motion, with logarithmic 

 decrement 0-00441, calculated and observed values are re- 

 spectively : 



1 0-969 0-816 0-675 0-531 0-393 0-248 0-0995 

 1 0-974 0-825 0-681 0-534 0-390 0-241 0-0990 



For the accuracy which has been obtained in the observa- 

 tions I am greatly indebted to the skill of Mr. J. Linton, 

 mechanic to the Department of Physics, University College, 

 Dundee, who constructed the apparatus used, with the 

 exception of the chronograph ; and to that of Mr. Ednie, 

 mechanic to the Physiological Department, University of 

 Edinburgh, who constructed the chronograph. I have also 

 to record my indebtedness to the Carnegie Trustees for a 

 grant which was in part expended on the construction of the 

 chronograph. 



WILLIAM PEDDIE 



