( 231 ) 

 TABLE VI. 



111 table VII we find the valiiey of Va from table III together with 

 those of /• fi'oiu tal>le VI. The difference between the two values is 

 indicated in the last column but one by ru\ the last column gives 

 the value of ri, as calculated bv formula (22), for H the value 

 17600 [C. (t. S.] having been taken. 



The accordance between the values of these two columns is very 

 satisfactorv and may be considered as a proof of the accuracy with 

 which in general the resistance to the motion of the string may be 



q 



determined bv means of the formula r = — (15). 



The ratio of the directly measured values of Va and r is 

 for string 10 as 1 : 1,615 

 „ 13 „ 1 : 1,69 

 „ 14 „ 1 : 1,34 



TABLE VIL 



To conclude this chapter we give some remarks concerning the 

 condition for which the motion of the quartz-thread just reaches the 

 limit of aperiodicity. In this condition we have the relation : 



4 m 



^ = -r (26) 



