PAPERS OX CHEMISTRY AND PHYSICS 



291 



at the end of the twenty-fourth interval, but just how 

 much farther it has to run, it would be difficult to say. 



Figure 2 shows the decrement in amplitude for 

 the same set of observations. The two curves are quite 

 similar in character. 



Figure 2. 



In figure 3 they are plotted on the same scale, and when 

 the two are placed side by side they are seen to be almost 

 identical. 



It is obvious that the interval approaches a minimum 

 as the amplitude approaches zero. That is. when the 

 curves are dra^vll on the same scale, the minimum on the 

 interval curve may be taken at the X axis on the ampli- 

 tude curve. In this case, the amplitude curve is two 



F:su:-e 



