226 PROCEEDINGS OP THE AMERICAN ACADEMY 



The following figures will illustrate the general character of the 

 results. The line marked "T" indicates the order in which the 

 forks were actually sounded. The line "B," indicates the sound 

 as noted by the listener at the receiving telephone. The number 

 of complete vibrations of the lower note transmitted was 0.88; of 

 the higher, 1.76. The doubtful estimations are followed by an 

 interrogation mark. 



TABLE I. 



T. C 3 C 3 C 4 C3 C 8 C 3 C4 C 3 C 3 C4 C 4 C4 

 R. C 3 C4 C 4 C 3 C 3 C 4 C4 C 3 C 3 C4 C4 C 3 



TABLE II. 



T. C 3 C4 C 3 C 3 C 3 C4 C4 C4 C 3 C4 C4 C4 

 R. C 3 C 4 C4 ? C 3 C 3 C4 C 4 C 3 ? C 3 C4 C4 C 3 



In the first of the above series it will be seen that three estima- 

 tions were wrong, nine right, none doubtful ; that is, 25 per cent 

 were wrong, 75 per cent right. In the second series one esti- 

 mate was wrong, two were doubtful, and nine correct; that is, 

 8.3 per cent were wrong, 16.7 per cent doubtful, and 75 per cent 

 correct. 



The following tables give a synopsis of results reached with the 

 C 3 and C 4 forks. Except in a very few cases, twelve successive 

 sounds were transmitted. The calculated duration of the sound is 

 in all cases given in terms of the vibration period of both notes. 

 The percentages are given to the nearest whole number. The first 

 column contains the serial number of the experiment; the second 

 (I), the percentage of incorrect estimates; the third (C), the per- 

 centage of correct estimates; the fourth (D), the percentage of 

 doubtful estimates ; the fifth (L) and the sixth (H), the dura- 

 tion of the sound in terms of the period of the lower and higher 

 notes respectively. The rates are always expressed in complete 

 vibrations. 



