274 Dr. A. M. Mayer's Researches in Acoustics. 



Column A gives the names of the sounds, and B the numbers 

 of their vibrations (v.d.) per second ; 0, the number of beats 

 of interrupted sound received by the ear in a second to blend 

 into a continuous uniform sensation. In column D are the 

 durations of the residual sonorous sensations, expressed in 

 vulgar fractions. The numbers in column D are obtained, 

 as already explained, by diminishing the reciprocals of the 

 numbers in column C by J. Under E are the fractions in 

 column D in decimals. Under F are the durations of the 

 residual sensations, computed by the formula 



D = SS + 18 ] '° 001 ' 



in which D equals the duration of the residual sensation given 

 by a sound of N number of vibrations per second. Under Gr 

 are the differences between the computed and observed values 

 of the residual sensations. These differences are so small, 

 except in the case of S0L 3 , that we may adopt the empirical 



Fig. 11. 



■ 



309 



AV 



NCI 



o >oo 400 0oo goo 1000 1200 1400 ~ \6BO 1600 2000 1100 2.4.00 2600 280O v.d. 



formula as expressing the law which connects the pitch of a 

 sound with the duration of its residual sonorous sensation. 



