866 



b' + l 



4jr' 



1 



3K\ {b' + lY + b'"- 





h' = 



2r 



T 



b" 





+ 1 



7V 4:t» + ó 



2 7' 



Hj means of tliese relations tlie (ables of page 864 and 865 liave been 



obtained, wliicli also contain tlie valnes of -^, the quantities b' and 



b", the velocity of propagation of the waves I" the wavelength ;. and 

 the damping-factor A = e—''', i.e. the ratio in which the amplitude 

 of the oscillation is reduced in a distance of 1 cm. 



7. It appears from these tables that not every sj'Stem of values 

 of T and 6 gives a possible system of values for K and 1\ or of 

 K and M. For 6 very small K and 3/ are very large and in that 

 case 7'(i ^ T ; as rf diminishes, K, 1\ and also J/ decrease, but. 



